Asymmetric synthesis of diarylmethylamines by diastereoselective addition of organometallic reagents to chiral N-tert-butanesulfinimines: switchover of diastereofacial selectivity
作者:Niklas Plobeck、David Powell
DOI:10.1016/s0957-4166(02)00099-x
日期:2002.3
Diastereoselective addition of organometallic reagents to chiral N-tert-butanesulfinimines gave alkylated adducts in high yields and diastereoselectivities. Cleavage of the chiral auxiliary under mildly acidic conditions gave diarylmethylamines in high yield. A reversal in the diastereoselectivity was observed by using either phenylmagnesium bromide in toluene or phenyllithium in THF. The use of the
非对映选择性加成有机金属试剂手性的ñ -叔-butanesulfinimines得到以高产率和非对映选择性烷基化的加合物。在弱酸性条件下手性助剂的裂解以高收率得到二芳基甲胺。通过使用甲苯中的苯基溴化镁或THF中的苯基锂,观察到非对映选择性的逆转。因此,使用相同的手性助剂可以合成许多二芳基甲胺的两种对映异构体。