Lewis acid mediated control of allylic epoxide opening in carbocyclization and halide addition pathways
作者:Andrew G. Myers、Michael Siu
DOI:10.1016/s0040-4020(02)00653-1
日期:2002.8
cyclizations of an allylic epoxide substrate with a tethered enol(ate) function as nucleophile. Both cation-olefin polycyclization pathways and SN-prime macrocyclization processes were observed to occur in the presence of different Lewis acid additives. Lewis acid additives were also observed to direct the stereochemistry of allylic epoxide opening by SN-prime addition of halide ions. This provided