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DOI: 10.1055/s-2003-39899
Formation of 1-Ethenylcyclopropanols Involving Kulinkovich Cyclopropanation and Peterson Olefination of α-Trimethylsilylesters
Publikationsverlauf
Publikationsdatum:
11. Juni 2003 (online)

Abstract
Mercuric iodide catalyzed condensation of bis-silylketene acetals with benzaldehyde provided a 1:1 erythro and threo mixture of α-trimethylsilylesters. Only the threo adducts underwent titanium(IV)-mediated cyclopropanation and acid induced Peterson olefination to provide (Z)-1-ethenylcyclopropanols of considerable synthetic potential.
Key words
condensation - elimination - ring closure - titanium - neighbouring group effect
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Fleming I.Dunoges J.Smithers R. Org. React. 1989, 37: 57 - 17 The cyclopropanol 2a (R1 = H)
was previously isolated as 3,5-dinitrobenzoate from the alkylation-cyclization
of ethyl 3-bromopropionate by Me3SiCH2MgBr/SmI2,
see:
Fukuzawa S.Furuya H.Tsuchimoto T. Tetrahedron 1996, 52: 1953 -
18a
Dicker IB. J. Org. Chem. 1993, 51: 2324 -
18b In this article (ref.) the J(threo) > J(erythro) relationship for the H2H3 coupling
constants, was erroneously based on the consideration of stronger
intramolecular hydrogen bonds in the threo comparatively
to the erythro adducts, see:
House HO.Crumrine DS.Teranishi AY.Olmstead HD. J. Am. Chem. Soc. 1973, 95: 3310 -
18c
However, there are no intramolecular hydrogen bond in the O-silylated diastereoisomers 6a,b and 7a,b. The coupling constants of erythro- 6a [J(H2H3) = 10.7 Hz] and of threo -7a [J(H2H3) = 10.4 Hz] were carefully measured by peak pickings.
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Colvin EW. In Silicon Reagents in Organic Synthesis Academic Press; London/New York: 1988. p.101 - To a solution of 4 g (11 mmol) of the 1:1 mixture of ethyl 3-phenyl-2-(trimethylsilyl)-3-(trimethylsilyloxy)propionate erythro -6a and threo- 7a in 15 mL of THF containing 0.62 g (2.2 mmol; 0.2 equiv) of Ti(i-PrO)4 was added dropwise a 2.54 M solution of ethylmagnesium bromide (11 mL, 27 mmmol; 2.5 equiv) in diethyl ether within 4 h. The reacting mixture was cooled to 0 °C (iced-water bath), then diluted with diethyl ether and hydrolyzed with 10 mL of aq NH4Cl. After filtration through celite, the separated organic layer was washed with brine, dried on Na2SO4 and concentrated in vacuo. Flash chromatography of the residue (eluant: pentane/diethyl ether 9:1) gave two products:
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20a
1-[2-Phenyl-1-(trimethylsilyl)-2-(trimethylsilyl-oxy)ethyl]cyclopropanol 9a: 1.94 g (52% yield); 1H NMR (250 MHz, CDCl3) δ -0.08 (s, 9 H), 0.71 (d, J = 4.95 Hz, 1 H), 0.25-0.88 (m, 4 H), 3.24 (s, 1 H), 5.33 (d, J = 4.95 Hz, 1 H), 7.19-7.33 (m, 5 H); 13C NMR (66 MHz, CDCl3): δ 0.21, 0.28, 13.27, 15.62, 46.13, 58.92, 78.75, 126, 126.9, 127.9, 144.4; IR 3463, 3379, 2974, 2949 cm-1; MS m/z (EI) 322 (2) [M+], 231 (42), 179 (31), 147 (17), 75 (36), 73 (100), 45 (16); MS m/z (CI with NH3) 340 (0.1), 252 (17), 251 (61), 250 (100), 233 (40), 232 (44), 231 (74) 217 (18), 179 (21), 160 (21), 155 (15), 144 (26), 1433 (100).
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20b
1-(2-Hydroxy-2-phenyl-1-trimethylsilylethyl)cyclo-propanol 9a′: (various amounts 5-10%); white solid: mp 107 °C; 1H NMR (250 MHz, CDCl3) δ -0.07 (s, 9 H), 0.76 (s, 1 H), 0.07-0.97 (m, 4 H), 2.58 (s, 1 H), 3.29 (s, 1 H), 5.44 (s, 1 H), 7.24-7.35 (m, 5 H); 13C NMR (66 MHz, CDCl3) δ 0.32, 13.41, 16.02, 44.86, 59.97, 77.97, 125.17, 126.91, 128.09, 144.41; IR: 3468, 2955, 2898 cm-1; MS m/z (EI) 231 (33), 159 (33), 145 (16), 131 (33), 115 (12), 103 (16), 79 (27), 77 (44), 75 (93), 73 (100), 79 (27), 45 (26); MS m/z (CI with NH3) 251 (19), 250 (81) [M+], 231 (10), 161 (16), 160 (13), 144 (13), 143 (100) 131 (8); Exact mass M+ 250.1377 (calcd for C14H22SiO2 250.1389).
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Salaün J.Ollivier J. Nouv. J. Chem. 1981, 5: 587 - 24
Ollivier J. PhD Thesis Université de Paris-Sud; Orsay France: 1986. - 25
Colvin EW. In Silicon Reagents in Organic Synthesis Academic Press; New York: 1988. p.65-69 - 27 Molecular mechanics calculations
(using a MM+ force field) and semi-empirical
ZINDO calculations have been performed with the Hyperchem software
(version 5.1). The Ti-O and Ti-C bond lengths and the Ti-bond angles
were in accord with reported RX data for titanium complexes. See:
Gais HJ.Volhardt J.Linder HJ.Paulus H. Angew. Chem., Int. Ed. Engl. 1988, 27: 1541
References
Base-induced Peterson olefination of cyclopropanols 9a and 11a led to ring-opened derivatives (see ref. 1).
22To a stirred solution of 340 mg (1 mmol) of cyclopropanol 9a in 5 mL of methanol at r.t. was added two drops of chlorotrimethylsilane. The reaction was complete within 2 h, as monitored by TLC. Then the solvent was removed in vacuo; flash chromatography of the residue (eluant: pentane/diethyl ether 9:1) gave 128 mg (76% yield) of 1-(Z)-styryl cyclopropanol 12. 1H NMR (250 MHz, CDCl3) δ 0.71-1.32 (m, 4 H), 2.16 (s, 1 H), 5.26 (d, J = 13 Hz, 1 H), 6.53 (d, J = 13 Hz, 1 H), 7.32-7.55 (m, 5 H); MS m/z (EI) 160 (41) [M+], 159 (74), 145 (54), 131 (68), 127 (36), 115 (43), 103 (63), 91 (33), 77 (100), 51 (52); MS m/z (CI with NH3) 178 (100), 161 (22), 160 (17), 159 (14), 143 (18), 131 (13).
26X-ray crystallographic data of the diol 9a′, will be published in Zeitschrift fuer Kristallographie.