New Preparation of Activated 2-Vinylaziridines from 1,4-Aminoalcohols
作者:Horacio F. Olivo、Michael S. Hemenway、Amy C. Hartwig、Raymond Chan
DOI:10.1055/s-1998-1635
日期:1998.3
Activated vinylaziridines (N-benzoyl, N-p-toluenesulfonyl, N-t-butoxycarbonyl and N-benzyloxycarbonyl) have been prepared from N-substituted 1,4-aminoalcohols using Mitsunobu conditions.
An Unusual Samarium Diiodide Mediated Reductive Ring Contraction of a Tricyclic Oxazine to a Highly-Functionalized Cyclopentane and Cyclobutane
作者:Barry J. McAuley、Mark Nieuwenhuyzen、Gary N. Sheldrake
DOI:10.1021/ol000057q
日期:2000.5.1
[reaction--see text] Samarium diiodide mediated reductive ringcontraction of a substituted tricyclo[2.2.2]oxazine at 25 degrees C leads to a mixture of cyclopentane and cyclobutane rearrangement products with complete diastereoselectivity in each case. At -78 degrees C, the anticipated amidocyclohexanol reduction product is obtained exclusively, while the cyclopentane is the sole product at reflux