作者:Rajendra P Jain、Robert M Williams
DOI:10.1016/s0040-4020(01)00542-7
日期:2001.7
A general asymmetric route to enantiomerically pure (S)-(+)-carnitine and analogs has been investigated that involves monoaddition of organometallic reagents to the lactone carbonyl group of (5R,6S)-4-(benzyloxycarbonyl)-5,6-diphenyl-2,3,5,6-tetrahydro-4H-1,4-oxazin-2-one and Lewis acid promoted stereoselective allylation of the resulting hemiacetals. The diastereomerically pure allyl oxazines thus
研究了对映体纯的(S)-(+)-肉碱和类似物的一般不对称路线,该路线涉及将有机金属试剂单加成到(5R,6S)-4-(苄氧基羰基)-5,6-二苯基内酯羰基上-2,3,5,6-四氢-4 H -1,4-恶嗪-2-酮和路易斯酸促进所得半缩醛的立体选择性烯丙基化。由此获得的非对映体纯的烯丙基恶嗪易于转化为对映体纯的(S)-(+)-肉碱和两个取代的类似物。