Developing a Diastereoselective Intramolecular [4 + 3] Cycloaddition of Nitrogen-Stabilized Oxyallyl Cations Derived from <i>N</i>-Sulfonyl-Substituted Allenamides
作者:Andrew G. Lohse、Richard P. Hsung、Mitchell D. Leider、Sunil K. Ghosh
DOI:10.1021/jo200147h
日期:2011.5.6
Efforts toward achieving a practical and diastereoselective intramolecular [4 + 3] cycloaddition of nitrogen-stabilizedoxyallylcations with tethered dienes are described. Epoxidation of N-sulfonyl substituted allenamides with dimethyldioxirane (DMDO) generates nitrogen-stabilizedoxyallylcations that readily undergo stereoselective [4 + 3] cycloaddition with dienes. Selectivity is found to depend