B(OMe)<sub>3</sub>as a Nonacidic Iminium Ion Generator in Mannich- and Ugi-Type Reactions
作者:Yusuke Tanaka、Kousuke Hidaka、Tomoaki Hasui、Michinori Suginome
DOI:10.1002/ejoc.200801190
日期:2009.3
Mannich-type reactions of aldehydes with secondary amines and a ketene silyl acetal were promoted by trimethoxyborane in DMSO to afford the corresponding β-amino esters in good yields. B(OMe)3 also promoted Ugi-type reactions ofaldehydes with secondary amines and isocyanides in 1,2-dichloroethane, which leads to the formation of α-amino amides. In these reactions, trimethoxyborane serves as an inexpensive
三甲氧基硼烷在 DMSO 中促进醛与仲胺和乙烯酮甲硅烷基缩醛的曼尼希型反应,以良好的产率得到相应的 β-氨基酯。B(OMe)3 还促进醛与仲胺和异氰化物在 1,2-二氯乙烷中的 Ugi 型反应,从而形成 α-氨基酰胺。在这些反应中,三甲氧基硼烷用作廉价、市售且几乎非酸性的亚胺离子发生器。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)