Concise Access to 2-Aroylbenzothiazoles by Redox Condensation Reaction between o-Halonitrobenzenes, Acetophenones, and Elemental Sulfur
摘要:
A wide range of 2-aroylbenzothiazoles 3 including some pharmacologically, relevant derivatives can be obtained in high yields by simply heating o-halonitrobenzenes 1, acetophenones 2, elemental sulfur, and N-methylmorpholine. This three-component nitro methyl Coupling was found to occur in an excellent atom-, step-, an redox-efficient manner in which elemental sulfur prayed the role of nucleophile building block and redox moderating agent to fulfill electronic requirements of the global reaction.