Acid-catalyzed reactions of epoxides 2 with homoallylicalcohol γ-adducts, 1 [Me2C(OH)CHRCHCH2], afford homoallylicalcohol α-adducts 3–5 via allyl-transferreaction, sometimes being more effective than those using the corresponding aldehydes.
Claisen rearrangements of equilibrating allylic azides
作者:Donald Craig、John W. Harvey、Alexander G. O'Brien、Andrew J. P. White
DOI:10.1039/c1ob05972f
日期:——
Equilibrating mixtures of allylic azide-containing allylic alcohols or allylic 2-tolylsulfonylacetic esters undergo Johnson–Claisen or Ireland–Claisen rearrangement reactions to give unsaturated γ-azidoesters and -acids, respectively. Decarboxylation of the acids under basic conditions gives azidosulfones, with moderate to high diastereoselectivity.