Synthesis, Inhaltsverzeichnis Synthesis 2021; 53(11): 1943-1954DOI: 10.1055/s-0040-1706002 paper A Short Approach to N-Aryl-1,2,3,4-tetrahydroisoquinolines from N-(2-Bromobenzyl)anilines via a Reductive Amination/Palladium-Catalyzed Ethoxyvinylation/Reductive N-Alkylation Sequence Authors Carina Glas Ricky Wirawan Franz Bracher ∗ Artikel empfehlen Abstract Alle Artikel dieser Rubrik(opens in new window) Abstract N-Aryl-1,2,3,4-tetrahydroisoquinolines are obtained via a convenient and short protocol with a broad range of substituents on both aromatic rings and high functional group tolerance. Starting from readily available ortho-brominated aromatic aldehydes and primary aromatic amines, condensation of these building blocks under reductive conditions gives N-aryl 2-bromobenzylamines. The C-3/C-4-unit of the tetrahydroisoquinoline is introduced using commercially available 2-ethoxyvinyl pinacolboronate under Suzuki conditions. Finally, the obtained crude ortho-ethoxyvinyl benzylamines are cyclized via an intramolecular reductive amination using the combination of triethylsilane/TFA to give the desired N-aryl-1,2,3,4-tetrahydroisoquinolines. Key words Key words N-aryl-1,2,3,4-tetrahydroisoquinolines - reductive cyclization - Pd-catalyzed ethoxyvinylation - reductive N-alkylation - cross-coupling Volltext Referenzen References 1a The Chemistry and Biology of Isoquinoline Alkaloids . Phillipson JD, Roberts MF, Zenk MH. Springer-Verlag; Berlin: 1985 1b Qing Z.-X, Huang J.-L, Yang X.-Y, Liu J.-H, Cao H.-L, Xiang F, Cheng P, Zeng J.-G. Curr. Med. Chem. 2018; 25: 5088 2a Lubisch W, Moeller A, Treiber H.-J, Knopp M. US6482832B1, 2002 2b Burke PJ, Wong LC, Jenkins TC, Knox RJ, Stanforth SP. Bioorg. Med. Chem. Lett. 2011; 21: 7447 2c Kalgutkar AS, Frederick KS, Chupka J, Feng B, Kempshall S, Mireles RJ, Fenner KS, Troutman MD. J. Pharm. Sci. 2009; 98: 4914 2d Vernier J.-M, De La Rosa MA, Chen H, Wu JZ, Larson GL, Cheney IW. 2e Buchanan JL, Bregman H, Chakka N, Dimauro EF, Du B, Nguyen HN, Zheng XM. WO2010022055A2, 2010 3a Barlaam B, Dantzman C. WO200246164A1, 2002 3b Adams GL, Cox JM, Debenham JS, Edmondson S, Gilbert E, Guo Y, Jiang Y, Josien H, Kim HM, Lan P, Miao S, Plummer CW, Rajagopalan M, Shah U, Sun Z, Suzuki T, Truong QT, Ujjainwalla F, Velazquez F, Venkatraman S, Wang N. WO2017201683A1, 2017 3c Funke U, Fischer S, Hiller A, Scheunemann M, Deuther-Conrad W, Brust P, Steinbach J. Bioorg. Med. Chem. Lett. 2008; 18: 4727 4a Álvarez M, Joule JA. Product Class 5: Isoquinolines. In Section 15.5, Science of Synthesis: Category 2, Hetarenes and Related Ring Systems, Vol. 15. Black DStC. Georg Thieme Verlag; Stuttgart: 2005: 661 4b Chrzanowska M, Grajewska A, Rozwadowska MD. Chem. Rev. 2016; 116: 12369 5 Reimann E, Höglmüller A. Arch. Pharm. 1985; 318: 559 6a Buckley BR, Christie SD. R, Elsegood MR. J, Gillings CM, Page PC. B, Pardoe WJ. M. Synlett 2010; 939 6b Forni JA, Brzozowski M, Tsanaktsidis J, Savage GP, Polyzos A. Aust. J. Chem. 2015; 68: 1890 6c Li Z, Li C.-J. J. Am. Chem. Soc. 2005; 127: 6968 6d Quach TD, Batey RA. Org. Lett. 2003; 5: 4397 6e Ueda H, Yoshida K, Tokuyama H. Org. Lett. 2014; 16: 4194 7a Hodson HF, Batchelor JF, Selway JW. T, Vinter JG, Iyer R. US4801593, 1989 7b Almena J, Foubelo F, Yus M. Tetrahedron 1996; 52: 8545 7c Ma Y.-N, Yang X.-J, Pan L, Hou Z, Geng H.-L, Song X.-P, Zhou L, Miao F. Chem. Pharm. Bull. 2013; 61: 204 8 Mottinelli M, Leese MP, Potter BV. L. Beilstein J. Org. Chem. 2017; 13: 1871 9a Schütz R, Meixner M, Antes I, Bracher F. Org. Biomol. Chem. 2020; 18: 3047 9b Schütz R, Schmidt S, Bracher F. Tetrahedron 2020; 76: 131150 9c Schütz R, Müller M, Gerndt S, Bartel K, Bracher F. Arch. Pharm. 2020; 353: e2000106 9d Schütz R, Müller M, Geisslinger F, Vollmar A, Bartel K, Bracher F. Eur. J. Med. Chem. 2020; 207: 112810 9e Melzer BC, Bracher F. Beilstein J. Org. Chem. 2017; 13: 1564 9f Melzer BC, Felber JG, Bracher F. Beilstein J. Org. Chem. 2018; 14: 130 9g Melzer B, Bracher F. Org. Biomol. Chem. 2015; 13: 7664 10 Glas C, Dietschreit JC. B, Wössner N, Urban L, Ghazy E, Sippl W, Jung M, Ochsenfeld C, Bracher F. Eur. J. Med. Chem. 2020; 206: 112676 11 Kamlah A, Bracher F. Lett. Org. Chem. 2019; 16: 931 12a Vögerl K, Ong DN, Bracher F. Synthesis 2018; 50: 1323 12b Bracher F. SynOpen 2018; 2: 96 12c Vögerl K, Ong N, Senger J, Herp D, Schmidtkunz K, Marek M, Müller M, Bartel K, Shaik TB, Porter NJ, Robaa D, Christianson DW, Romier C, Sippl W, Jung M, Bracher F. J. Med. Chem. 2019; 62: 1138 13 Popp TA, Uhl E, Ong DN, Dittrich S, Bracher F. Tetrahedron 2016; 72: 1668 14a Zhang X.-L, Yu P, Wu Y.-W, Wu Q.-P, Zhang Q.-S. J. Chem. Res. 2014; 38: 261 14b Chen B.-C, Sundeen JE, Guo P, Bednarz MS, Zhao R. Tetrahedron Lett. 2001; 42: 1245 15 Barder TE, Walker SD, Martinelli JR, Buchwald SL. J. Am. Chem. Soc. 2005; 127: 4685 16 Sakamoto T, Kondo Y, Yasuhara A, Yamanaka H. Tetrahedron 1991; 47: 1877 17 For related observations on N-methylations using 1,3,5-trioxane and triethylsilane/TFA, see: Popp TA, Bracher F. Synthesis 2015; 47: 3333 18 Swinnen D, Gerber P, Gonzalez J, Bombrun A, Jorand-Lebrun C. WO2005012280A1, 2005 19a Earley RA, Gallagher MJ. J. Organomet. Chem. 1969; 20: 117 19b Jiang M, Li J, Wang F, Zhao Y, Zhao F, Dong X, Zhao W. Org. Lett. 2012; 14: 1420 20 Xu Y, Xu Z.-J, Liu Z.-P, Lou H. Org. Chem. Front. 2019; 6: 3902 21 Gaertzen O, Buchwald SL. J. Org. Chem. 2002; 67: 465 22 Sud A, Sureshkumar D, Klussmann M. Chem. Commun. 2009; 3169 23 Wang J, Sun Y, Wang G, Zhen L. Eur. J. Org. Chem. 2017; 6338 24 Chen K, Pullarkat SA. Org. Biomol. Chem. 2012; 10: 6600 25 Baechler SA, Fehr M, Habermeyer M, Hofmann A, Merz K.-H, Fiebig H.-H, Marko D, Eisenbrand G. Bioorg. Med. Chem. 2013; 21: 814 26 Hindley RM, Baggaley KH. US4362892A, 1982 27 Kang X, Wu X, Han X, Yuan C, Liu Y, Cui Y. Chem. Sci. 2020; 11: 1494 28 Oishi S, Yoshimoto J, Saito S. J. Am. Chem. Soc. 2009; 131: 8748 29 Brzozowski M, Forni JA, Paul Savage G, Polyzos A. Chem. Commun. 2015; 51: 334 30 Dastbaravardeh N, Schnürch M, Mihovilovic MD. Eur. J. Org. Chem. 2013; 2878 Zusatzmaterial Zusatzmaterial Supporting Information (PDF)