Allylation sulfur substituted active methylene compounds such as RSCH2Y [Y = C(=O)R, COOR, CN] with allylic bromides in the presence of bases gives a mixture of the SN2-product and the apparent SN2′-product. The former product is selectively obtained in alkylation in a nonpolar solvent. Synthetic utility of this regiospecific allylation is demonstrated in the simple synthesis of pellitorine.
烯丙基
溴化物与如RSCH2Y [Y = C(=O)R, COOR, CN] 的
硫取代活性亚甲基化合物在碱存在下发生烯丙基化反应,产生SN2产物和表观SN2′产物的混合物。在非极性溶剂中,前者产物在烷基化过程中被选择性获得。该区域特异性烯丙基化的合成应用通过简单合成披帚草碱得到了验证。