Asymmetric synthesis of both enantiomers of esters and γ-lactones from optically active 1-chlorovinyl p-tolyl sulfoxides and lithium ester enolates with the formation of a tertiary or a quaternary carbon stereogenic center at the β-position
作者:Shimpei Sugiyama、Tsuyoshi Satoh
DOI:10.1016/j.tetasy.2004.11.085
日期:2005.2
synthesized from aldehydes or unsymmetrical ketones and (R)-(−)-chloromethyl p-tolyl sulfoxide in two or three steps, with the lithium enolate of tert-butyl acetate gave optically active adducts in 99% chiral induction from the sulfur stereogenic center. The adducts were converted to optically active esters, carboxylic acids, and γ-lactones, which have a tertiary or a quaternary carbon stereogenic center at
光学活性的1-氯乙烯基的治疗p具有在2-位,这是从醛或不对称酮和(合成了两种不同的取代基间-甲苯基砜[R - ( - ) -氯甲基)p -甲苯基砜在两个或三个步骤,用乙酸叔丁酯的烯醇锂从硫立体异构中心以99%的手性诱导生成旋光加合物。加合物被转化为光学活性的酯,羧酸和γ-内酯,它们在β-位具有叔碳或季碳立体异构中心。通过这种方法从2-环己烯酮开始实现了旋光性螺内酯的合成。