The transient 1-azafulvenium methides 24, 26 and 28 generated by thermal extrusion of sulfur dioxide from pyrrolo[1,2-c][1,3]thiazole 2,2-dioxide 20 (R = Me), 22 and 23 undergo sigmatropic [1,8]H shifts and the 1-acyl derivatives 30 electrocyclise to give novel pyrrolo[1,2-c][1,3]oxazines 32. The analogous 1,2-diazafulvenium methide 36 has been intercepted in [8 + 2] cycloadditions with electron-rich silylated acetylenes to give adducts 37-40. This behaviour is partially explained by Frontier MO theory.
|Number of pages||47|
|Journal||Journal of the Chemical Society, Perkin Transactions 1|
|Publication status||Published - 2001|
- azafulvenium methides
- organic chemistry
- sulfur dioxide