作者:Justin P. Vitale、Scott A. Wolckenhauer、Nga M. Do、Scott D. Rychnovsky
DOI:10.1021/ol051039h
日期:2005.7.1
[reaction: see text]. Three segment-coupling Prins approaches to the C3-C19 segment of phorboxazole B have been developed. One successful strategy utilized a novel TMSBr-mediated cyclization that proceeded with complete axial selectivity. Displacement of bromide with cesium acetate provided the C13 hydroxyl stereocenter of 22. Additionally, treatment of alpha-acetoxy ether 20 with TFA enabled a more