Chemistry of Nitrosoimines. XVI. A New Method for Facile Preparation of Azamonomethinecyanines<i>via</i>Nitrosoimines
作者:Kin-ya Akiba、Kiyofumi Ishikawa、Naoki Inamoto
DOI:10.1246/bcsj.51.535
日期:1978.2
The reaction of 3-substituted 2-nitrosoimino-2,3-dihydrobenzothiazoles (1) with Grignard-type reagents of 3-substituted 2-imino-2,3-dihydrobenzothiazoles (2) gave azamonomethinecyanines (3) in high yields (71–96%). This is a new type of reaction for the preparation of 3. Hydrolysis of 3 afforded ring-opened disulfides, bis[o-N-methyl-N-(3-methyl-2,3-dihydrobenzothiazol-2-ylidenecarbamoyl)amino}-phenyl]