Synthesis of Ethyl 8‐Aryl‐8‐hydroxy‐3‐oxo‐8H[1,2,4]oxadiazolo‐[3,4‐c][1,4]thiazine‐5‐carboxylates by Ring‐Expansion Rearrangement
摘要:
The title compounds were prepared by the ring-ring interconversion of ethyl 5-nitroso-6-arylimidazo[2,1-b] thiazole-3-carboxylates with hydrochloric acid. The effect of electron-withdrawing substituent in the thiazole ring on the general applicability of the ring-ring interconversion has been also evaluated.
Synthesis of Ethyl 8‐Aryl‐8‐hydroxy‐3‐oxo‐8H[1,2,4]oxadiazolo‐[3,4‐c][1,4]thiazine‐5‐carboxylates by Ring‐Expansion Rearrangement
摘要:
The title compounds were prepared by the ring-ring interconversion of ethyl 5-nitroso-6-arylimidazo[2,1-b] thiazole-3-carboxylates with hydrochloric acid. The effect of electron-withdrawing substituent in the thiazole ring on the general applicability of the ring-ring interconversion has been also evaluated.