188646-19-7Relevant academic research and scientific papers
Synthesis and reactions of lactam sulfonium salts with a sulfonio bridgehead. Part 1. 4,4a,5,6-tetrahydro-5-oxo-1H-thiopyrano[1,2-a]-1,4-benzothiazinium perchlorates
Kataoka, Tadashi,Nakamura, Yoshihide,Matsumoto, Harutoshi,Iwama, Tetsuo,Kondo, Hirohito,Shimizu, Hiroshi,Muraoka, Osamu,Tanabe, Genzoh
, p. 309 - 316 (1997)
Tricyclic benzothiazinium salts 3 are prepared by [2++4] polar cycloaddition of thionium intermediates 2A, generated from the corresponding α-chloro sulfides 2, and dienes in the presence of silver perchlorate. Ring transformation of benzothiaz
