作者:Someshwar Nagamalla、Joel T. Mague、Shyam Sathyamoorthi
DOI:10.1021/acs.orglett.1c04310
日期:2022.1.28
We present a new ring-opening reaction of epoxides by pendant silanols, catalyzed by either Ph3C+BF4– or BINOL-phosphoric acid. Silanol epoxides derived from trans-allylic alcohols, cis-allylic alcohols, trans-homoallylic alcohols, and cis-homoallylic alcohols were all compatible and gave products from either endo- or exo-ring opening. With silanol epoxides derived from 4-alkenyl silanols, an unusual
我们提出了一种新的环氧化物开环反应,该反应由侧链硅烷醇进行,由 Ph 3 C + BF 4 –或 BINOL-磷酸催化。衍生自反式烯丙醇、顺式烯丙醇、反式高烯丙醇和顺式高烯丙醇的硅烷醇环氧化物都是相容的,并且可以从内环或外环开环得到产物。对于衍生自 4-烯基硅烷醇的硅烷醇环氧化物,观察到不寻常的重排形成四氢呋喃产物。该方法的实用性在受保护的d-阿拉伯糖醇的简短制备中得到了证明。