Diastereoselective Allylation and Crotylation Reactions of Aldehydes with Potassium Allyl- and Crotyltrifluoroborates under Lewis Acid Catalysis
作者:Robert A. Batey、Avinash N. Thadani、David V. Smil、Alan J. Lough
DOI:10.1055/s-2000-6303
日期:——
Potassium allyl- and crotyltrifluoroborates react with aldehydes in a process catalyzed by a variety of Lewis acids, to give the corresponding homoallylic alcohols. Of the Lewis acids examined, BF3 · OEt2, used either stoichiometrically or catalytically, was found to most efficiently catalyze this reaction. The air and moisture stable potassium organotrifluoroborate salts react with a variety of alkyl, α- or β-substituted alkyl, and aryl aldehydes, and lead to the adducts in high yield and with high diastereoselectivity.
烯丙基和巴豆基三氟硼酸钾与醛在多种路易斯酸催化的过程中反应,生成相应的同烯丙基醇。在所研究的路易斯酸中,无论是按化学计量使用还是催化使用,BF3·OEt2被发现是催化这一反应效率最高的。这些对空气和水分稳定的含钾有机三氟硼酸盐与多种烷基、α-或β-取代的烷基以及芳香醛反应,以高产率和高非对映选择性生成加合物。