Reusable cobalt-phthalocyanine in water: efficient catalytic aerobic oxidative coupling of thiols to construct S–N/S–S bonds
作者:Yingchao Dou、Xin Huang、Hao Wang、Liting Yang、Heng Li、Bingxin Yuan、Guanyu Yang
DOI:10.1039/c7gc00401j
日期:——
A new aerobic oxidative coupling of thiols in water to construct sulfenamides or disulfides was developed, utilizing cobalt(II)phthalocyanine-tetra-sodium sulfonate as the catalyst and O2 as the oxidant. The mother liquor could be recycled up to 20 times with negligible loss of activity and only a minor decrease of product yield.
An iodine-mediated sulfenamides synthesis was reported. By using iodine as oxidant, various heterocyclic thiols and amines (mainly secondary amines) could smoothly proceed the CDC reaction, affording the target N−S formation products with good yields. The protocol features metal-free, easy performance, and short reaction time.
A 1-(2-benzothiazolylthio)-piperidine compound of the formula: ##STR1## WHEREIN R is a lower alkyl group substituted at least at the 3, 4 and/or 5 positions and n is an integer from 1 to 3, which is prepared by the reaction of 2-mercaptobenzothiazole or its reactive derivative with an alkylated piperidine or its N-halogenated derivative and useful as a vulcanization accelerator having an improved scorching property.