作者:G. Sundararajan、Prabagaran Narayanasamy
DOI:10.1021/ol006898e
日期:2001.2.8
affords polymers, onto which lithium and aluminum are incorporated via reaction with lithium aluminum hydride. The resulting insoluble polymers containing chiral lithium and aluminum active centers are quite effective for asymmetric Michael addition of nitro compounds, thiols, and amines. The optimized reaction conditions yield Michael adducts in good yield with high enantiomeric excesses.
[图:见正文] 单体 (R,R)-3-aza-3-(p-vinylbenzyl)-1,5-diphenyl-1,5-dihydroxypentane (2) 当与苯乙烯和二乙烯基苯聚合时提供聚合物,其上锂和铝通过与氢化铝锂反应结合。由此产生的含有手性锂和铝活性中心的不溶性聚合物对于硝基化合物、硫醇和胺的不对称迈克尔加成非常有效。优化的反应条件以良好的收率产生具有高对映体过量的迈克尔加合物。