Unexpected Products from Mesoionic 1,3-Thiazinium and Oxazinium Olates: A Novel Access to 3,5-Diaryl-1,3-thiazine-2,4,6-trione and Alkoxy-3,5-diphenyl-3H-1,3-oxazine-2,6-dione Derivatives
作者:Mahboobeh Zahedifar、Hassan Sheibani
DOI:10.1071/ch14095
日期:——
4-olates II, respectively. At room temperature, appropriately substituted mesoionic 1,3-thiazinium 4-olates I eliminated the corresponding alkene with generation of 3,5-diaryl-1,3-thiazine-2,4,6-trione derivatives 3. However, the methoxy-substituted compound 5 was stable at room temperature at least for several weeks. In the case of the mesoionic1,3-oxazinium 4-olates II an alkyl group migration affords 4-alkoxy-3
(氯羰基)的缩合烯酮1与Ñ -phenylthiocarbamates 2和Ñ -phenylcarbamates 6被假定为导致不稳定的介离子1,3-噻嗪-4- olates的形成我或1,3-恶嗪-4- olates II分别。在室温下,适当取代的介离子1,3-噻嗪-4- olates我消除了生成3,5-二芳基-1,3-噻嗪-2,4,6-三酮衍生物的相应的烯烃3。但是,甲氧基取代的化合物5在室温下至少稳定数周。就中离子的1,3-恶嗪鎓4-油酸酯而言II,烷基迁移提供4-烷氧基-3,5-二苯基-3 H -1,3-恶嗪-2,6-二酮7。