MesP(Li)TMS, and an aldehyde affords Mes-phosphaalkenes which, upon methanol addition and P-oxidation, react with a second carbonyl compound site specifically to produce unsymmetric alkenes. The E/Z selectivity of the one-pot cross coupling is largely determined by the electronic nature of the aryl substituent of the first aldehyde, with electron-donating groups giving rise to increased amounts of Z-alkenes.
锂化的仲膦MesP(Li)TMS与醛之间的
磷酸-彼得森反应提供了Mes-
磷烯烃,在
甲醇加成和P-氧化后,Mes-
磷烯烃与第二个羰基化合物位点专门反应生成不对称烯烃。一锅交叉偶联的E / Z选择性在很大程度上取决于第一醛的芳基取代基的电子性质,给电子基团导致Z-烯烃的量增加。