Asymmetric Synthesis of 2,3-Dihydrofurans by Reaction of Rhodium-Stabilized Vinylcarbenoids with Vinyl Ethers
作者:Huw M. L. Davies、Gulzar Ahmed、Rebecca L. Calvo、Melvyn Rowen Churchill、David G. Churchill
DOI:10.1021/jo972189b
日期:1998.4.1
Rhodium(II) octanoate catalyzed decomposition of 2-diazo-3-siloxybutenoates, containing (R)-pantolactone as a chiral auxiliary, in the presence of vinyl ethers results in the diastereoselective synthesis of cyclopropanes with high asymmetric induction. Treatment of the cyclopropanes with tetrabutylammonium fluoride results in desilylation and ring expansion of the resulting acylcyclopropanes to 2,3-dihydrofurans
在乙烯基醚存在下,辛酸铑(II)催化包含(R)-泛内酯作为手性助剂的2-重氮-3-甲硅烷氧基丁烯酸酯的分解导致非对映选择性合成具有高不对称诱导作用的环丙烷。用四丁基氟化铵处理环丙烷导致甲硅烷基化和所得酰基环丙烷至2,3-二氢呋喃的扩环,并保留了立体化学。