At low temperature, 1-alkoxy-1,3-dienes add to sulfur dioxide activated by a Lewis or protic acid generating zwitterionic intermediates that can be quenched by enoxysilanes. The resulting β,γ-unsaturated silyl sulfinates can be desilylated by 1:1 Pd(OAc)2/PPh3 catalyst, liberating the corresponding β,γ-unsaturated sulfinic acids that undergo smooth and highly stereoselective retro-ene eliminations
在低温下,将1-烷氧基-1,3-二烯添加到路易斯或质子酸活化的
二氧化硫中,生成两性离子中间体,该中间体可被环氧
硅烷淬灭。可以用1:1 Pd(OAc)2 / PPh 3催化剂将所得的β,γ-不饱和甲
硅烷基亚
磺酸盐脱甲
硅基,从而释放出相应的β,γ-不饱和亚
磺酸,后者经过顺滑和高度立体选择性的逆向
二氧化硫消除。该方法已应用于产生对映体纯的聚
丙烯酸酯片段。