N-Benzoyl-N-methylsulfonyl anthranilates: unexpected cyclization reaction to 4-alkoxy-2,1-benzothiazines
作者:Giuseppe Manfroni、Francesco Meschini、Ferdinando Costantino、Oriana Tabarrini、Violetta Cecchetti
DOI:10.3998/ark.5550190.0012.912
日期:——
The synthesis of 4-alkoxy-1H-2,1-benzothiazine 2,2-dioxide derivatives was achieved through an unexpected base-mediated cyclization of N-benzoyl-N-methylsulfonylanthranilates. A reaction mechanism involving the sulfene species has been postulated. The obtained 4-alkoxy derivatives can be further functionalized at the N-1 position allowing unsymmetrically N,Odisubstituted 1H-2,1-benzothiazines 2,2-dioxide
4-烷氧基-1H-2,1-苯并噻嗪 2,2-二氧化物衍生物的合成是通过 N-苯甲酰基-N-甲基磺酰氨基苯甲酸酯的意外碱介导环化实现的。已经假设了涉及亚砜物种的反应机制。获得的 4-烷氧基衍生物可以在 N-1 位进一步官能化,从而制备不对称的 N,O 二取代的 1H-2,1-苯并噻嗪 2,2-二氧化物。