Journal
ORGANIC LETTERS
Volume 18, Issue 6, Pages 1426-1429Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.6b00363
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Funding
- National Natural Science Foundation of China [21202060]
- Key Scientific and Technological Project in Jilin Province [20140204041GX]
- Creative Program in Jilin University [336OEP01, 336OEP06]
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An unprecedented approach for the synthesis of imine derivatives was achieved via a Pd(II)-catalyzed dearomatization reaction of N-aryl ureas with internal alkynes. The corresponding spirocyclic imine derivatives were obtained with 20 examples in good to excellent yields. Mechanistic investigation indicated that an interesting 1,3-palladium migration process led to the alpha-regioselective dearomatization when 2-naphthyl ureas were used as the substrates. Fused ring products could also be obtained to further prove this migration process.
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