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Paper | Regular issue | Vol 68, No. 5, 2006, pp.1007-1015
Published online, 31st March, 2006
DOI: 10.3987/COM-06-10714
Regioselectivity in 1,3-Dipolar Cycloaddition of 3-(4-Ethoxyphenyl)-4-cyanosydnone with Propargylic Esters

En-Ming Chang, Fung Fuh Wong,* Tse-Hsin Chen, Kuo-Chen Chiang, and Mou-Yung Yeh*

*Sustainable Environment Research Center, National Cheng Kung University, No. 500, Sec. 3, An-ming Rd., Tainan City, Taiwan, R.O.C.


A regioselective 1,3-dipolar cycloaddition of 3-(4-ethoxyphenyl)-4-cyanosydnone with propargylic esters having a bulky alkyl group was developed. This new reaction provided alkyl 5-cyano-1-aryl-1H-pyrazole-3-carboxylate as a major product.