Baker's yeast reduction of prochiral γ-nitroketones: Enantioselective synthesis of (S)-4-nitroalcohols
作者:Antonio Guarna、Ernesto G. Occhiato、Laura M. Spinetti、Maria E. Vallecchi、Dina Scarpi
DOI:10.1016/0040-4020(94)01056-6
日期:1995.2
The baker'syeastreduction of seven different prochiral nitroketones 1a-g occurred on the re face of the carbonyl group, thus affording the (S)-nitroalcohols 2a-g, with different level of enantioselectivity (e.e. 15–99%). The best results (e.e. = 99%) were achieved when the substituent R is markedly different from the nitroalkyl group [e.g. 1a (R = Me) and 1e (R = o-MeO-C6H4)]. The e.e. and the configuration
Baker的七个不同的前手性硝基酮酵母还原1A-G上发生了重新羰基的面,由此提供第(小号)-nitroalcohols 2A-G ,具有不同水平的对映选择性(EE 15-99%)。当取代基R与硝基烷基显着不同时(例如1a(R = Me)和1e(R = o -MeO-C 6 H 4)),可获得最佳结果(ee = 99%)。通过相应的Mosher酯的NMR研究确定了生物产物的ee和构型,在一种情况下(2d)的化学相关性。还描述了从2d开始的光学活性内酯7和吡咯烷11的合成。