Intramolecular Capture of Pummerer Reaction Intermediates by an Aromatic Nucleophile: Selective Construction of 1,4-Benzothiazine and Indole Ring Systems.
作者:Yoshie HORIGUCHI、Akihiro SONOBE、Toshiaki SAITOH、Jun TODA、Takehiro SANO
DOI:10.1248/cpb.49.1132
日期:——
The simple alkyl sulfoxide 6 carrying two aromatic nucleophiles, when treated with trifluoroacetic anhydride at room temperature (Pummerer reaction conditions), underwent an intramolecular aromatic sulfenylation of the 6-exo-tet process in an exclusive manner to yield two regioisomeric 1,4-benzothiazine derivatives, 8 and 9. On the other hand, a similar reaction of the alpha-acyl sulfoxide 7, possessing
当在室温下(Pummerer反应条件)用三氟乙酸酐处理时,带有两个芳族亲核试剂的简单烷基亚砜6以排他的方式经历了6-exo-tet过程的分子内芳族亚磺酰化反应,从而生成两个区域异构的1,4-苯并噻嗪另一方面,衍生物8和9。具有相同芳族亲核试剂的α-酰基亚砜7的类似反应导致5-exo-trig过程的分子内芳族烷基化,从而生成3-oxo-吲哚衍生物14以定量的产量。这些结果证明,1,4-苯并噻嗪和吲哚环系统的结构可以以选择性方式由亚砜侧链的适当选择来实现。