作者:Douglas T. Genna、Christopher P. Hencken、Maxime A. Siegler、Gary H. Posner
DOI:10.1021/ol102142a
日期:2010.10.15
γ-seleno-α,β-ethylenic esters, when treated with sulfuryl chloride and ethyl vinyl ether in hexanes, produced α-chloro-β,γ-ethylenic esters in 65−75% yields, with ee values of 95−97%, and with 1,3-syn transfer of chirality. Reaction of these allylic chloride electrophiles with methylcuprate and with sodium azide nucleophiles afforded exclusively γ-substituted-α,β-ethylenic esters with faithful anti-transfer
手性非外消旋的γ-硒代-α,β-烯键式酯,在己烷中用硫酰氯和乙基乙烯基醚处理后,以65-75%的产率产生α-氯-β,γ-烯键式酯,ee值为95-97 %,并具有1,3-syn手性转移。这些烯丙基氯亲电试剂与甲基铜酸酯和叠氮化钠亲核试剂反应,仅得到γ-取代的-α,β-烯键式酯,在毫克数级上具有可靠的手性抗转移性。