Lewis acid-catalyzed three-component condensation reactions of aldehydes, alkoxysilanes, and allenylsilanes: synthesis of α-propargyl ethers
作者:Lui Niimi、Shuichi Hiraoka、Tsutomu Yokozawa
DOI:10.1016/s0040-4020(01)01145-0
日期:2002.1
Lewis acid-catalyzed reaction of acetals with allenylsilanes and the three-component reactions of aldehydes, alkoxysilanes, and allenylsilanes are described. Both reactions are strongly dependent on the substituent at the α-position of allenylsilanes. Allenylsilanes having bulky substituents such as the tert-butyl and isopropyl groups result in the corresponding α-propargyl ethers in high yields, whereas
描述了路易斯酸催化的缩醛与烯丙基硅烷的反应以及醛,烷氧基硅烷和烯丙基硅烷的三组分反应。两个反应都强烈依赖于烯丙基硅烷的α-位上的取代基。具有大的取代基(例如叔丁基和异丙基)的烯丙基硅烷可产生高产率的相应α-炔丙基醚,而具有甲基和乙基的烯丙基硅烷不仅可提供低产率的相应α-炔丙基醚,而且还可提供环丙基酮和α,β-不饱和酮为副产物。