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Short Paper | Regular issue | Vol 91, No. 11, 2015, pp.2172-2179
Published online, 27th October, 2015
DOI: 10.3987/COM-15-13311
Synthesis of Isocoumarins: Rhenium Complex-Catalyzed Cyclization of 2-Ethynylbenzoic Acids

Rui Umeda, Shunya Yoshikawa, Kouji Yamashita, and Yutaka Nishiyama*

*Faculty of Chemistry and Materials Engineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan

Abstract

When 2-ethynylbenzoic acids were treated with a catalytic amount of a rhenium complex, such as ReCl(CO)5, 6-endo cyclization of 2-ethynylbenzoic acids proceeded with a high selectivity to give the corresponding isocoumarins in moderate to good yields.