α-Sulfonyl benzylic carbanions, derived from ortho-halobenzyl sulfones 5 (Hal = Br, I), can be easily generated by the phosphazene base P2-Et and react with different electrophiles such as alkyl halides, aldehydes and ethyl acrylate. Palladium catalysed cross-coupling reactions performed at the halogen atom, followed by P2-Et-mediated alkylation-dehydrosulfinylation process using bromoacetates as electrophiles allow the preparation of ortho-substituted cinnamates.
α-磺酰基苄基碳负离子,源自邻卤代
苄基砜 5 (Hal = Br, I),可以很容易地由
磷腈碱 P2-Et 生成,并与不同的亲电子试剂如烷基卤、醛和
丙烯酸乙酯发生反应。在卤素原子上进行
钯催化的交叉偶联反应,然后使用
溴乙酸盐作为亲电子试剂进行 P2-Et 介导的烷基化-脱氢亚磺酰化过程,可以制备邻位取代的
肉桂酸酯。