Synthesis, Table of Contents REVIEW© Georg Thieme Verlag Stuttgart · New YorkApplications of N-Chlorosuccinimide in Organic SynthesisW. Marek Gołebiewski*, Mirosław GucmaInstitute of Industrial Organic Chemistry, 6 Annopol St., 03-236 Warsaw, PolandFax: +48(22)8110799; e-Mail: golebiewski@ipo.waw.pl; Recommend Article Abstract Buy Article All articles of this category Abstract N-Chlorosuccinimide (NCS) is a versatile reagent and its significance is not limited to chlorination and oxidation. It mediates or catalyzes many chemical reactions, including halocyclizations, formation of heterocyclic systems, formation of new carbon-carbon bonds, rearrangements, and functional group transformations. 1 Introduction 2 Chlorinations 3 Replacement of Other Groups by Chlorine 4 Halocyclizations 5 Rearrangements and Functional Group Transformations 6 Formation of New Carbon-Carbon Bonds 7 Formation of Heterocyclic Systems 8 Oxidations 9 Deprotections 10 Transformations of NCS 11 Miscellaneous Reactions 12 Biological Activity of NCS 13 Conclusions Key words N-halosuccinimides - N-chlorosuccinimide - chlorination - oxidation - deprotection - rearrangement Full Text References References <A NAME="RE18407SS-1">1</A> Bender G. Chem. Ber. 1886, 19: 2268 <A NAME="RE18407SS-2">2</A> Tscherniac J. Chem. Ber. 1901, 34: 4213 <A NAME="RE18407SS-3">3</A> Zimmer A. J. Am. Chem. Soc. 1954, 76: 3856 <A NAME="RE18407SS-4">4</A> Hirst M. J. Chem. Soc. 1922, 121: 2175 <A NAME="RE18407SS-5">5</A> Bretheric L. Handbook of Reactive Chemical Hazards 5th ed.: Butterworth-Heinemann; London: 1995. <A NAME="RE18407SS-6">6</A> Tilstam U. Weinman H. Org. Process Res. Dev. 2002, 6: 384 <A NAME="RE18407SS-7">7</A> Junge EC. Spangler PL. Duncan WP. J. Org. Chem. 1966, 31: 3836 <A NAME="RE18407SS-8">8</A> Djerassi C. Chem. Rev. 1948, 43: 271 <A NAME="RE18407SS-9">9</A> Horner L. Winkelmann EH. Angew. Chem. 1959, 71: 349 <A NAME="RE18407SS-10">10</A> Filler R. Chem. Rev. 1963, 63: 21 <A NAME="RE18407SS-11">11</A> De Mattos RT. Lachter ER. Neto AC. Quim. Nova 1985, 8: 17 <A NAME="RE18407SS-12">12</A> Pizey JS. Synthetic Reagents Vol. 2: Wiley; New York: 1974. p.1 <A NAME="RE18407SS-13">13</A> Larock RC. Comprehensive Organic Transformations 1st ed.: VCH; Weiheim: 1989. p.315 <A NAME="RE18407SS-14">14</A> Neale RS. Schepers RG. Walsh MR. J. Org. Chem. 1964, 29: 3390 <A NAME="RE18407SS-15">15</A> Paul DF. Haberfield P. J. Org. Chem. 1976, 41: 3170 <A NAME="RE18407SS-16">16</A> Nickson TE. Roche-Dolson CA. Synthesis 1985, 669 <A NAME="RE18407SS-17">17</A> Bovonsombat P. McNelis E. Synthesis 1993, 237 <A NAME="RE18407SS-18">18</A> Goldberg Y. Alper H. J. Org. Chem. 1993, 58: 3072 <A NAME="RE18407SS-19">19</A> Duan S. Turk J. Speigle J. Corbin J. Masnovi J. Baker RJ. J. Org. Chem. 2000, 65: 3005 <A NAME="RE18407SS-20">20</A> Tanemura K. Suzuki T. Nishida Y. Satsumabayashi K. Horaguchi T. Chem. Lett. 2003, 932 <A NAME="RE18407SS-21">21</A> Zhang Y. Shibatomi K. Yamamoto H. Synlett 2005, 2837 <A NAME="RE18407SS-22">22</A> Prakash GKS. Mathew T. Hoole D. Esteves PM. Wang Q. Rasul G. Olah GA. J. Am. Chem. Soc. 2004, 126: 15770 <A NAME="RE18407SS-23">23</A> Day RA. Blake JA. Stephens CE. Synthesis 2003, 1586 <A NAME="RE18407SS-24">24</A> Magnus P. McIver EG. Tetrahedron Lett. 2000, 41: 831 <A NAME="RE18407SS-25">25</A> Stefani HA. Pereira CMP. Almeida RB. Braga RC. Guzen KP. Cella R. Tetrahedron Lett. 2005, 46: 6833 <A NAME="RE18407SS-26">26</A> De Rosa M. Nieto GC. Tetrahedron Lett. 1988, 29: 2405 <A NAME="RE18407SS-27">27</A> De Rosa M. Nieto GC. Gago FF. J. Org. Chem. 1989, 54: 5347 <A NAME="RE18407SS-28">28</A> De Rosa M. Shadle RG. Foster N. Chem. Commun. 1993, 1757 <A NAME="RE18407SS-29">29</A> Harsanyi MC. Norris RK. Aust. J. Chem. 1987, 40: 2063 <A NAME="RE18407SS-30">30</A> Buciarelli M. Forni A. Moretti I. Torre G. J. Org. Chem. 1983, 48: 2640 <A NAME="RE18407SS-31">31</A> West B. Barret HW. J. Am. Chem. Soc. 1954, 76: 3146 <A NAME="RE18407SS-32">32</A> Ikemoto T. Wakimasu M. Heterocycles 2001, 55: 99 <A NAME="RE18407SS-33">33</A> Ponce MA. Tarzi OI. Erra-Balsells R. J. Heterocycl. Chem. 2003, 40: 419 <A NAME="RE18407SS-34">34</A> Hervet M. Galtier C. Enguehard C. Gueiffier A. Debouzy J.-C. J. Heterocycl. Chem. 2002, 39: 737 <A NAME="RE18407SS-35A">35a</A> Anderson AG. Forkey DM. Grina LD. Hickernell LW. Tober TY. Wills MT. J. Org. Chem. 1975, 40: 2196 <A NAME="RE18407SS-35B">35b</A> Anderson AG. Tober TY. J. Org. Chem. 1980, 45: 1695 <A NAME="RE18407SS-36">36</A> Kurasawa Y. Satoh W. Matsuzaki I. Maesaki Y. Okamoto Y. Kim HS. J. Heterocycl. Chem. 2003, 40: 837 <A NAME="RE18407SS-37">37</A> Chiang YH. J. Org. Chem. 1971, 36: 2146 <A NAME="RE18407SS-38">38</A> Rheinboldt H. Liebigs Ann. Chem. 1927, 451: 161 <A NAME="RE18407SS-39">39</A> Peake CJ. Strickland JH. Synth. Commun. 1986, 16: 763 <A NAME="RE18407SS-40">40</A> Sammelson RE. Miller RB. Kurth MJ. J. Org. Chem. 2000, 65: 2225 <A NAME="RE18407SS-41">41</A> Kim JN. Ryn EK. J. Org. Chem. 1992, 57: 6649 <A NAME="RE18407SS-42">42</A> Kanemasa S. Matsuda H. Kamimura A. Kakinami T. Tetrahedron 2000, 56: 1057 <A NAME="RE18407SS-43">43</A> Kumar V. Kaushik MP. Tetrahedron Lett. 2006, 47: 1457 <A NAME="RE18407SS-44">44</A> Liu K.-C. Shelton BR. Howe RK. J. Org. Chem. 1980, 45: 3916 <A NAME="RE18407SS-45">45</A> Brochard L. Joseph B. Viaud M.-C. Rollin P. Synth. Commun. 1994, 24: 1403 <A NAME="RE18407SS-46A">46a</A> Gucma M. Goūbiewski WM. Synth. Commun. 2007, article submitted <A NAME="RE18407SS-46B">46b</A> Goūbiewski WM. Gucma M. J. Heterocycl. Chem. 2006, 43: 509 <A NAME="RE18407SS-47">47</A> Smith MB. March J. In March’s Advanced Organic Chemistry 6th ed.: Wiley; Hoboken: 2007. p.849 <A NAME="RE18407SS-48">48</A> Guillemin JC. Denis JM. Synthesis 1985, 1131 <A NAME="RE18407SS-49">49</A> Lacombe S. Pellerin B. Guillemin JC. Denis JM. Pfister-Guillouzo G. J. Org. Chem. 1989, 54: 5958 <A NAME="RE18407SS-50">50</A> Davies JW. Durrant ML. Walker MP. Malpass JR. Tetrahedron 1992, 48: 4379 <A NAME="RE18407SS-51">51</A> Antelo JM. Arce F. Crugeiras J. Pastoriza C. Rios A. J. Chem. Res., Synop. 2001, 20 <A NAME="RE18407SS-52">52</A> Tokuda M. Fujita H. Suginome H. J. Chem. Soc., Perkin Trans. 1 1994, 777 <A NAME="RE18407SS-53">53</A> Butz V. Vilsmaier E. Maas G. J. Chem. Soc., Perkin Trans. 2 1993, 1907 <A NAME="RE18407SS-54">54</A> Verhé R. De Kimpe N. De Buyck L. Schamp N. Synthesis 1975, 455 <A NAME="RE18407SS-55A">55a</A> De Kimpe N. Keppens M. Fonck G. Chem. Commun. 1996, 635 <A NAME="RE18407SS-55B">55b</A> De Kimpe N. Tehrani KA. Stevens C. De Cooman P. Tetrahedron 1997, 53: 3693 <A NAME="RE18407SS-56">56</A> Timmons C. Chen D. Xu X. Li G. Eur. J. Org. Chem. 2003, 3850 <A NAME="RE18407SS-57">57</A> Ramesh NG. Heijne EH. Klunder AJH. Zwaneburg B. Tetrahedron Lett. 1998, 39: 3295 <A NAME="RE18407SS-58">58</A> Murray RE. Synth. Commun. 1980, 10: 345 <A NAME="RE18407SS-59">59</A> Meijer EW. Kellog RM. Wynberg H. J. Org. Chem. 1982, 47: 2005 <A NAME="RE18407SS-60">60</A> Hori T. Sharpless KB. J. Org. Chem. 1979, 44: 4204 <A NAME="RE18407SS-61">61</A> Mellegard-Waetzig SR. Wang C. Tunge JA. Tetrahedron 2006, 62: 7191 <A NAME="RE18407SS-62">62</A> Uzarewicz A. Œcianowski J. Bąkowska-Janiszewska J. Pol. J. Chem. 2000, 74: 777 <A NAME="RE18407SS-63">63</A> Deagostino A. Tivola PB. Prandi C. Venturello P. Synlett 1999, 1841 <A NAME="RE18407SS-64">64</A> Uchibori Y. Umeno M. Seto H. Yoshioka H. Chem. Lett. 1993, 673 <A NAME="RE18407SS-65">65</A> Ohkata K. Mase M. Akiba K.-y. J. Chem. Soc., Chem. Commun. 1987, 1727 <A NAME="RE18407SS-66">66</A> Dalla V. Pale P. Tetrahedron Lett. 1996, 37: 2777 <A NAME="RE18407SS-67">67</A> Yeung Y.-Y. Gao X. Corey EJ. J. Am. Chem. Soc. 2006, 128: 9644 <A NAME="RE18407SS-68">68</A> Finkelstein L. J. Am. Chem. Soc. 1951, 73: 302 <A NAME="RE18407SS-69">69</A> Hebbelynck M. Bull. Soc. Chim. Belg. 1950, 59: 193 <A NAME="RE18407SS-70">70</A> Yamane T. Mitsudera H. Shundoh T. Synthesis 2004, 2825 <A NAME="RE18407SS-71">71</A> Yamane T. Mitsudera H. Shundoh T. Tetrahedron Lett. 2004, 45: 69 <A NAME="RE18407SS-72A">72a</A> Lee JC. Bae YH. Chang S.-K. Bull. Korean Chem. Soc. 2003, 24: 407 <A NAME="RE18407SS-72B">72b</A> Meshram HM. Reddy PN. Sadashiv K. Yadav JS. Tetrahedron Lett. 2005, 46: 623 <A NAME="RE18407SS-73">73</A> Vaz ADN. Schoellmann G. J. Org. Chem. 1984, 49: 1286 <A NAME="RE18407SS-74">74</A> Hintermann L. Togni A. Helv. Chim. Acta 2000, 83: 2425 <A NAME="RE18407SS-75">75</A> Frantz R. Hintermann L. Perseghini M. Broggini D. Togni A. Org. Lett. 2003, 5: 1709 <A NAME="RE18407SS-76">76</A> Marigo M. Bachmann S. Halland N. Braunton A. Jorgensen KA. Angew. Chem. Int. Ed. 2004, 43: 5507 <A NAME="RE18407SS-77">77</A> Heasley VL. Elliott SL. Erdman PE. Figureoa DE. Krosley KW. Louie TJ. Moore HB. Mudge BP. Nogales DF. Nordeen J. Oakes ML. Rosbrugh JW. Sauerbrey AM. Shibuya TY. Stanley MS. Stewart CC. Shellhamer DF. Heasley GE. J. Chem. Soc., Perkin Trans. 2 1991, 393 <A NAME="RE18407SS-78">78</A> Meshram HM. Reddy PN. Vishnu P. Sadashiv K. Yadav JS. Tetrahedron Lett. 2006, 47: 991 <A NAME="RE18407SS-79">79</A> Halland N. Braunton A. Bachmann S. Marigo M. Jörgensen KA. J. Am. Chem. Soc. 2004, 126: 4790 <A NAME="RE18407SS-80">80</A> Halland N. Lie MA. Klaersgaard A. Marigo M. Schiott B. Jörgensen KA. Chem. Eur. J. 2005, 11: 7083 <A NAME="RE18407SS-81">81</A> Harpp DN. Bao LQ. Black CJ. Gleason JG. Smith RA. J. Org. Chem. 1975, 40: 3420 <A NAME="RE18407SS-82">82</A> Harpp DN. Bao LQ. Black CJ. Smith RA. Gleason JG. Tetrahedron Lett. 1974, 15: 3235 <A NAME="RE18407SS-83">83</A> Freihammer PM. Detty MR. J. Org. Chem. 2000, 65: 7203 <A NAME="RE18407SS-84">84</A> Eliad L. Hoz S. J. Phys. Org. Chem. 2002, 15: 540 <A NAME="RE18407SS-85A">85a</A> Dilworth BM. McKervey MA. Tetrahedron 1986, 42: 3731 <A NAME="RE18407SS-85B">85b</A> Paquette LA. Snow RA. Klobucar WD. Synth. Commun. 1976, 6: 575 <A NAME="RE18407SS-85C">85c</A> Detty MR. J. Org. Chem. 1980, 45: 274 <A NAME="RE18407SS-86">86</A> Lebarillier L. Outurquin F. Paulmier C. Tetrahedron 2000, 56: 7495 <A NAME="RE18407SS-87">87</A> Ogura K. Imaizumi J.-i. Iida H. Tsuchihashi G.-i. Chem. Lett. 1980, 1587 <A NAME="RE18407SS-88">88</A> Paquette LA. Houser RW. J. Org. Chem. 1971, 36: 1015 <A NAME="RE18407SS-89">89</A> Langler RF. LeBlanc LM. Smith LL. Austr. J. Chem. 1993, 46: 1085 <A NAME="RE18407SS-90">90</A> Satoh T. Sakairi N. Chem. Lett. 2003, 1162 <A NAME="RE18407SS-91A">91a</A> Castro BR. Org. React. 1983, 29: 1 <A NAME="RE18407SS-91B">91b</A> Baran PS. Richter JM. J. Am. Chem. Soc. 2005, 127: 15394 <A NAME="RE18407SS-92">92</A> Sekar G. Nishiyama H. J. Am. Chem. Soc. 2001, 123: 3603 <A NAME="RE18407SS-93">93</A> Chowdhury S. Roy S. J. Org. Chem. 1997, 62: 199 <A NAME="RE18407SS-94">94</A> Collazo LR. Guziec FS. Hu W.-X. Pankayatselvan R. Tetrahedron Lett. 1994, 35: 7911 <A NAME="RE18407SS-95">95</A> Tamaru Y. Mizutani M. Furaukawa Y. Kawamura S.-i. Yoshida Z.-i. Yanagi K. Minobe M. J. Am. Chem. Soc. 1984, 106: 1079 <A NAME="RE18407SS-96">96</A> Kayser MM. Zhu J. Hooper DL. Can. J. Chem. 1997, 75: 1322 <A NAME="RE18407SS-97">97</A> Blough BE. Mascarella SW. Rothman RB. Carroll FI. J. Chem. Soc., Chem. Commun. 1993, 758 <A NAME="RE18407SS-98">98</A> Ranu BC. Jana U. J. Org. Chem. 1999, 64: 6380 <A NAME="RE18407SS-99">99</A> Booker-Milburn KI. Fedouloff M. Paknoham SJ. Strachan JB. Melville JL. Voyle M. Tetrahedron Lett. 2000, 41: 4657 <A NAME="RE18407SS-100">100</A> Iranpoor N. Firouzabadi H. Aghapour G. Synth. Commun. 2002, 32: 2535 <A NAME="RE18407SS-101">101</A> Frøyen P. Synth. Commun. 1995, 25: 959 <A NAME="RE18407SS-102">102</A> Iranpoor N. Firouzabadi H. Azadi R. Ebrahimzadeh F. Can. J. Chem. 2006, 84: 69 <A NAME="RE18407SS-103">103</A> Karimi B. Seradj H. Maleki J. Tetrahedron 2002, 58: 4513 <A NAME="RE18407SS-104">104</A> Hodosi G. Tetrahedron Lett. 1994, 35: 6129 <A NAME="RE18407SS-105">105</A> Morton HE. Leanna MR. Tetrahedron Lett. 1993, 34: 4481 <A NAME="RE18407SS-106">106</A> Masuyama Y. Yamamoto N. Kurusu Y. Synlett 2002, 2113 <A NAME="RE18407SS-107">107</A> Nakajima M. Warner JC. Anselme J.-P. Tetrahedron Lett. 1984, 25: 2619 <A NAME="RE18407SS-108">108</A> Maguire AR. Murphy ME. Schaeffer M. Ferguson G. Tetrahedron Lett. 1995, 36: 467 <A NAME="RE18407SS-109">109</A> Masuyama Y. Kobayashi Y. Yanagi R. Kurusu Y. Chem. Lett. 1992, 2039 <A NAME="RE18407SS-110">110</A> Pelter A. Smith K. Elgendy S. Rowlands M. Tetrahedron Lett. 1989, 30: 5643 <A NAME="RE18407SS-111">111</A> Vilsmaier E. Scheiber L. Synthesis 1980, 465 <A NAME="RE18407SS-112">112</A> Katayama S. Watanabe T. Yamauchi M. Chem. Pharm. Bull. 1993, 41: 439 <A NAME="RE18407SS-113">113</A> Gasman PA. Amick DR. Tetrahedron Lett. 1974, 15: 889 <A NAME="RE18407SS-114">114</A> Kawahare M. Nishida A. Nakayama M. Org. Lett. 2000, 2: 675 <A NAME="RE18407SS-115A">115a</A> Hossain KM. Kameyama T. Shibata T. Takagi K. Bull. Chem. Soc. Jpn. 2001, 74: 2415 <A NAME="RE18407SS-115B">115b</A> Hossain KM. Kameyama T. Shibata T. Takagi K. Synlett 2000, 1137 <A NAME="RE18407SS-116">116</A> Collibee WL. Nakajima M. Anselme J.-P. J. Org. Chem. 1995, 60: 468 <A NAME="RE18407SS-117">117</A> Konstntinova LS. Rakitin OA. Rees CW. Souvorova LI. Torroba T. J. Chem. Soc., Perkin Trans. 1 1999, 1023 <A NAME="RE18407SS-118">118</A> Gomez T. Macho S. Miguel D. Neo AG. Rodriguez T. Torroba T. Eur. J. Org. Chem. 2005, 5055 <A NAME="RE18407SS-119">119</A> Kreisberg JD. Magnus P. Shinde S. Tetrahedron Lett. 2002, 43: 7393 <A NAME="RE18407SS-120">120</A> Kuhn R. Munzig W. Chem. Ber. 1953, 86: 858 <A NAME="RE18407SS-121">121</A> Eihorn J. Eihorn C. Ratajczak F. Pierre J.-L. J. Org. Chem. 1996, 61: 7452 <A NAME="RE18407SS-122A">122a</A> Mukaiyama T. Matsuo J.-i. Iida D. Kitagawa H. Chem. Lett. 2001, 846 <A NAME="RE18407SS-122B">122b</A> Matsuo J.-i. Iida D. Yamanaka H. Mukaiyama T. Tetrahedron 2003 59, 6739 <A NAME="RE18407SS-123">123</A> Matsuo J.-i. Kawana A. Kamiyama H. Bull. Chem. Soc. Jpn. 2003, 76: 1433 <A NAME="RE18407SS-124">124</A> Tidwell TT. Synthesis 1990, 857 <A NAME="RE18407SS-125">125</A> Pulkkinnen JT. Vepsalainen J. J. Org. Chem. 1996, 61: 8604 <A NAME="RE18407SS-126">126</A> Nishide K. Ohsugi S. Fudesaka M. Kodama S. Node M. Tetrahedron Lett. 2002, 43: 5177 <A NAME="RE18407SS-127">127</A> Halligudi NN. Desai SM. Nandibewoor ST. Indian J. Chem., Sect. A: Inorg. Bio-inorg. Phys. Theor., Anal. Chem. 1999, 38: 943 <A NAME="RE18407SS-128">128</A> Nishiguchi A. Maeda K. Miki S. Synthesis 2006, 4131 <A NAME="RE18407SS-129">129</A> Harville R. Reed SF. J. Org. Chem. 1968, 33: 3976 <A NAME="RE18407SS-130">130</A> Thenraja D. Subramaniam P. Srinivasan Ch. J. Chem. Soc., Perkin Trans. 2 2002, 2125 <A NAME="RE18407SS-131">131</A> Shih H. J. Org. Chem. 1993, 58: 3003 <A NAME="RE18407SS-132">132</A> Niezioek M. Kot M. Pyka K. Mak P. Kozik A. Acta Biochim. Pol. 2003, 50: 753 <A NAME="RE18407SS-133">133</A> Ashish S. Chhaya S. Ashok K. Singh B. Indian J. Chem., Sect. A: Inorg. Bio-inorg. Phys. Theor. 2005, 44: 476 <A NAME="RE18407SS-134">134</A> Wilbur DS. Anderson KW. J. Org. Chem. 1982, 47: 358 <A NAME="RE18407SS-135">135</A> Bandgar BP. Kunde LB. Thote JL. Synth. Commun. 1997, 27: 1149 <A NAME="RE18407SS-136">136</A> Iranpoor N. Firouzabadi H. Shaterian HR. Tetrahedron Lett. 2003, 44: 4769 <A NAME="RE18407SS-137">137</A> Vankar YD. Kumaravel G. Tetrahedron Lett. 1984, 25: 233 <A NAME="RE18407SS-138">138</A> Finkelstein M. Moore WM. Ross SD. Eberson L. Acta Chem. Scand., Ser. B 1986, 40: 402 <A NAME="RE18407SS-139">139</A> Hartke K. Teuber D. Gerber H.-D. Tetrahedron 1988, 44: 3261 <A NAME="RE18407SS-140">140</A> Savarin C. Srogl J. Liebeskind LS. Org. Lett. 2002, 4: 4309 <A NAME="RE18407SS-141">141</A> Vilsmaier E. Sprügel W. Justus Liebigs Ann. Chem. 1971, 747: 151 <A NAME="RE18407SS-142">142</A> Borovikova GS. Levchenko ES. Kaminskaya EI. Zh. Org. Khim. 1986, 22: 100 ; J. Org. Chem. USSR (Engl. Transl.) 1986, 22, 86 <A NAME="RE18407SS-143">143</A> Buu-Hoi NP. Demerseman P. J. Org. Chem. 1953, 18: 649 <A NAME="RE18407SS-144A">144a</A> Haake M. Benack H. Synthesis 1976, 308 <A NAME="RE18407SS-144B">144b</A> Haake M. Benack H. Synthesis 1976, 310 <A NAME="RE18407SS-145">145</A> Goldwhite H. Saunders BC. J. Chem. Soc. 1955, 2040 <A NAME="RE18407SS-146">146</A> Campillo N. Paez JA. Goya P. Eur. J. Org. Chem. 2002, 2109 <A NAME="RE18407SS-147">147</A> Hoshi M. Shirakawa K. Tetrahedron Lett. 2000, 41: 2595 <A NAME="RE18407SS-148">148</A> Ruck-Braun K. Stamm A. Engel S. Kunz H. J. Org. Chem. 1997, 62: 967 <A NAME="RE18407SS-149">149</A> Kohl HH. Whitley WB. Worley SD. Bodor N. J. Pharm. Sci. 1980, 69: 1292