Cyclization Cascades Initiated by 1,6-Conjugate Addition
作者:Joshua L. Brooks、Alison J. Frontier
DOI:10.1021/ja308451y
日期:2012.10.10
two different 1,6-conjugate addition-initiated cyclizationcascades. One is a 1,6-conjugateaddition/cyclization sequence with incorporation of the nucleophile, and the other is catalyzed by DABCO and is thought to proceed via a cyclic acetoxonium intermediate. The reaction behavior of substrates lacking the tethered acetate was also studied. The scope of both types of cyclizationcascades, the role of