Answers are grounded in this paper and cite their sources.
A new copper-catalyzed oxidative ipso-cyclization of N-(p-methoxyaryl)propiolamides with disulfides for the synthesis of 3-(arylthio)-1-azaspiro[4.5]deca-3,6,9-triene-2,8-diones has been developed. This method proceeds via sequential oxidative C–S bond formation, ipso-cyclization, and dearomatization and provides a new facile oxidative strategy to assemble the target products using an inexpensive catalytic system comprising copper(II) chloride and molecular oxygen.
No takes yet. Share an insight, caveat, or question.
Song et al. (2015) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: