Reagent-Controlled Asymmetric Homologation of Boronic Esters by Enantioenriched Main-Group Chiral Carbenoids
作者:Paul R. Blakemore、Stephen P. Marsden、Huw D. Vater
DOI:10.1021/ol053055k
日期:2006.2.1
and (S)-1-chloro-2-phenylethyllithium (26), generated in situ by sulfoxide ligand exchange from (-)-(R(S),R)-1-chloro-2-phenylethyl p-tolyl sulfoxide (8), effected the stereocontrolled homologation of boronic esters. sec-Alcohols derived from the product boronates by oxidation with basic hydrogen peroxide exhibited % ee closely approaching that of sulfoxide 8 in examples employing Li-carbenoid 26.
[反应:参见正文]通过亚砜配体交换从原位生成的推定对映体富集类胡萝卜素物质(R)-1-氯-2-苯基乙基氯化镁(9)和(S)-1-氯-2-苯基乙基锂(26) (-)-(R(S),R)-1-氯-2-苯基乙基对甲苯基亚砜(8)实现了硼酸酯的立体控制同源性。在使用Li-类胡萝卜素26的实例中,通过用碱性过氧化氢氧化衍生自硼酸盐产物的仲醇所显示的ee百分数接近于亚砜8的百分数。