Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 81, Issue 12, Pages 5181-5189Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.6b00773
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Funding
- National Science Foundation of China [21372068, 21572049]
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A highly efficient addition cyclization of Nmethyl-N-arylacrylamides with arylaldehydes or benzene-sulfonohydrazides was developed using a catalytic amount of the quaternary ammonium salt (TBAI) under metal-free conditions, leading to the carbonyl- and sulfone-containing oxindoles. Compared to previous Methods, which require excessive amounts of explosive organic peroxides and precious or toxic metal reagents, the present protocol, which gave access to 3,3-disubstituted oxindoles, is,a safe and green approach, resulting in the formation of various useful carbonyl- and sulfone-containing oxindoles in yields of 40-94%.
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