Modulating the stereochemical outcome of the Ireland–Claisen reaction of (E)- and (Z)-allylic glycolates
作者:Ken S. Feldman、Brandon R. Selfridge
DOI:10.1016/j.tetlet.2011.12.011
日期:2012.2
The diastereoselectivity of Ireland–Claisen rearrangements of allylic glycolates is dependent on the E:Z ratio of the silyl ketene acetals, the alkene geometry in the allyl unit, and the transition state topography. High yields and excellent diastereoselectivities (>95:5) have been achieved for selected substrates, including those with R2 = ethyl that results in a newly formed quaternary center. A