Palladium-Catalyzed Decarboxylative Rearrangements of Allyl 2,2,2-Trifluoroethyl Malonates: Direct Access to Homoallylic Esters
作者:Lawrence P. Tardibono、Jerod Patzner、Cara Cesario、Marvin J. Miller
DOI:10.1021/ol901518g
日期:2009.9.17
from allyl 2,2,2-trifluoroethyl malonates by using a Pd(0) catalyst. Facile decarboxylation of allyl 2,2,2-trifluoroethyl malonates is attributed to a decrease in pKa compared to allyl methyl malonates. Subsequent reduction of the homoallylic 2,2,2-trifluoroethyl ester provides a (hydroxyethyl)cyclopentenyl derivative that represents a key intermediate in the synthesis of carbocyclic nucleosides. A select
通过使用 Pd(0) 催化剂,从丙二酸烯丙酯 2,2,2-三氟乙酯单次转化即可获得高烯丙酯。与烯丙基甲基丙二酸酯相比,烯丙基 2,2,2-三氟乙基丙二酸酯的轻松脱羧归因于 p K a的降低。随后将高烯丙基 2,2,2-三氟乙酯还原得到(羟乙基)环戊烯基衍生物,它是碳环核苷合成中的关键中间体。精选的 2,2,2-三氟乙基丙二酸烯丙酯经过脱羧克莱森重排以提供区域异构的高烯丙基酯。