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Note | Regular issue | Vol 57, No. 11, 2002, pp.2163-2173
Published online, 1st January, 1970
DOI: 10.3987/COM-02-9589
Hantzsch Dihydropyridine: An Effective and Convenient Regioselective Reducing Agent for the 5-Benzylidene-2,4-thiazolidinedione Derivatives

Hong Woo Lee,* Bok Young Kim, Joong Bok Ahn, Hoe Joo Son, Jae Wook Lee, Soon Kil Ahn, and Chung Il Hong

*Chemical Process Development Laboratories, Chong Kun Dang Research Institute, Chonan P.O. Box 74, Chonan, 330-831, Korea


An effective and convenient regioselective reduction of 5-benzylidene 2,4-thiazolidinedione derivatives to the corresponding 5-benzyl 2,4-thiazolidinedione derivatives has been accomplished using 3,5-dicarbethoxy-2,6-dimethyl-1,4-dihydropyridine (Hantzsch dihydropyridine ester : HEH) with silica gel as an acid catalyst in a good yield.