Total Synthesis of (+)-Ileabethoxazole via an Iron-Mediated Pauson–Khand [2 + 2 + 1] Carbocyclization
作者:David R. Williams、Akshay A. Shah
DOI:10.1021/ja5043462
日期:2014.6.18
describe the total synthesis of (+)-ileabethoxazole (1) using a Stille cross-coupling reaction of propargylic stannanes with 5-iodo-1,3-oxazoles to produce 1,1-disubstituted allenes (11). An iron-mediated [2 + 2 + 1] carbocyclization yields a novel cyclopentenone for elaboration to 1. Site-selective palladium insertion reactions allow for regiocontrolled substitutions of the heterocycle. Asymmetric copper