Molecular sieve mediated decarboxylative Mannich and aldol reactions of β-ketoacids
作者:Fangrui Zhong、Chunhui Jiang、Weijun Yao、Li-Wen Xu、Yixin Lu
DOI:10.1016/j.tetlet.2013.06.030
日期:2013.8
A molecular sieve mediated decarboxylativeMannichreaction of β-ketoacids with sulfonyl imines is reported; this protocol leads to an efficient preparation of synthetically useful β-amino ketones. An analogous molecular sieve promoted decarboxylative aldol reaction between β-ketoacids and isatins is also described, which affords bioactive 3-substituted-3-hydroxy-oxindoles in excellent yields.
A gold-catalyzed regiospecific hydration of N-tosyl propargylic amines has been developed. In the presence of a catalytic amount of the gold catalyst NaAuCl4·2H2O, both alkyl and aryl-substituted N-tosyl propargylic amines were smoothly converted into the corresponding β-amino ketones with excellent regioselectivities and high yields (up to 85%). Further transformations of the obtained β-amino ketones