作者:Jing Lin、Wing Hong Chan、Albert W.M. Lee、Wai Yeung Wong
DOI:10.1016/s0040-4020(99)00872-8
日期:1999.12
The use of enantiomerically pure sultams (+)-1 and (−)-1 as practical chiral auxiliaries for asymmetric alkylation reactions is described in full. Deprotonation of the N-acylated products derived from the auxiliaries with sodium hexamethyldisilazide followed by treatment with alkyl halides gave products with high diastereoselectivity. On treatment with excess racemic α-bromopropanoate or α-bromobutanoate
完整描述了对映体纯的阿马酚(+)- 1和(-)- 1作为不对称烷基化反应的实际手性助剂。衍生自助剂的N-酰化产物用六甲基二硅叠氮化钠脱质子,然后用烷基卤化物处理,得到具有高非对映选择性的产物。用过量的外消旋α-溴丙酸酯或α-溴丁酸酯处理时,相应的N-酰基sultam的烯酸酯经历高度非对映选择性烷基化,以提供完全绝对控制两个连续手性中心的产物。