Addition of 2-(chloromagnesiomethyl)2-alkenyl ethers to epoxides followed by Pd(0)-catalyzed cyclization: a one-pot synthesis of 3-methylenetetrahydropyrans
作者:Jaap van der Louw、Juul L. van der Baan、Gerardus J.J. Out、Franciscus J.J. de Kanter、Friedrich Bickelhaupt、Gerhard W. Klumpp
DOI:10.1016/s0040-4020(01)92281-1
日期:1992.11
Addition of 2-(chloromagnesiomethyl)-2-propenyl ethers 1a and 1b to epoxides 3 affords ring opening products 6 or 7 which are converted by Pd(0) to 3-methylenetetrahydropyrans 9. Cyclization of the addition products is best effected by a catalyst system generated in situ from Pd(OAc)2 and (i-PrO)3P.