作者:Seymour L. Shapiro、Kurt Weinberg、Louis Freedman
DOI:10.1021/ja01528a030
日期:1959.10
Highly diastereoselective 1,3-dipolar cycloaddition reactions of trans-2-methylene-1,3-dithiolane 1,3-dioxide with 3-oxidopyridinium and 3-oxidopyrylium betaines: a route to the tropane skeleton
作者:Varinder K. Aggarwal、Richard S. Grainger、Gary K. Newton、Peter L. Spargo、Adrian D. Hobson、Harry Adams
DOI:10.1039/b302834h
日期:——
The C2-symmetric vinyl sulfoxide, trans-2-methylene-1,3-dithiolane1,3-dioxide, was found to react with a range of 3-oxidopyridinium betaines (bearing different substituents on nitrogen) in high yield and with total diastereoselectivity. A 2.3:1 mixture of regioisomers was formed with all of the 3-oxidopyridinium betaines but the ratio was found to change over prolonged periods of time due to reversibility