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Short Paper | Regular issue | Vol 96, No. 10, 2018, pp.1786-1794
Published online, 22nd October, 2018
DOI: 10.3987/COM-18-13974
■ HBr-Promoted Sulfenylation of Pyrazolones and 4-Hydroxycoumarins with N-(Organothio)succinimides

Hongai Jin, Wangyang Wang, Zhaohua Yan,* Rongxing Zhang, Mingchuang He, and Sen Lin*

*College of Chemistry, Nanchang University, No. 999, Xuefu Rd. 330031, China

Abstract

A convenient, effective and metal-free method for the synthesis of C-4 sulfenylated pyrazolones via HBr-promoted sulfenylation of pyrazolones with N-(organothio)succinimides as sulfur sources was developed. The method can be extended to apply for substrates 4-hydroxycoumarins. A series of C-4 sulfenylated pyrazolones and C-3 sulfenylated 4-hydroxycoumarins were smootly synthesized in good to excellent yields.