8H-Anhydro-4-hydroxy-2-oxo-1,3-thiazinium Hydroxides as Mesoionic 1,4-Dipoles
摘要:
The previously unknown 8H-anhydro-4-hydroxy-2-oxo-1,3-thiazinium hydroxides (1) were prepared and their 1,4-dipolar cycloaddition behavior was examined. In most cases, elimination of the proton in the 8-position of the mesoionic ring was observed to occur unless extremely reactive dipolarophiles were used. The S,N-ketene acetals were converted to the corresponding alpha-diazo ketones for further study.
[EN] NOVEL IMIDAZOPYRIDINE AND PYRAZOLOPYRIDINE SULFONAMIDE DERIVATIVES [FR] NOUVEAUX DÉRIVÉS D'IMIDAZOPYRIDINE ET DE PYRAZOLOPYRIDINE SULFONAMIDE
摘要:
The invention relates to novel compounds having the general formula I wherein R1, R2, X1, X2,X3and W are as described herein, composition including the compounds and methods of using the compounds.