Bifunctional chiral auxiliaries 8: Utilisation of tartaric acid derived auxiliaries in aldol and alkylation reactions
作者:Stephen G. Davies、Gary B. Evans、Susan Pearce
DOI:10.1016/s0040-4020(01)90480-6
日期:——
homochiral C2 symmetric 1,3-diacylimidazolidin-2-ones prepared from natural tartaric acid undergo highly diastereoselective aldol and alkylation reactions. Cleavage of these diastereomerically pure, adducts gives homochiral (1R,2S)-1-phenyl-2-methylpropane-1,3-diol and (2R,3R)-3-hydroxy-3-phenyl-2-methylpropanoic acid and (2S)-3-phenyl-2-methylpropan-1-ol (>92% ee). One of these auxiliaries, 4,5-dim
由天然酒石酸制备的三个新的同手性C 2对称的1,3-二酰基咪唑烷基-2-酮的硼烯酸酯经历高度非对映选择性的羟醛和烷基化反应。切割这些非对映体纯的加合物得到高手性的(1R,2S) -1-苯基-2-甲基丙烷-1,3-二醇和(2 R,3 R)-3-羟基-3-苯基-2-甲基丙酸和(2 S)-3-苯基-2-甲基丙烷-1-醇(> 92%ee)。在所有以前报道的手性助剂中,这些助剂之一是4,5-二甲基咪唑烷基-2-酮具有最低的有效分子量。