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Cis-tetrahydro tarboline ester,i.e(1R,3R)-methyl-1,2,3,4-tetrahydro-1-(3,4-methyl ene-dioxyphenyl)-9H-pyrido [3,4-b]indole-3-carboxylate hydro-chloride is a key chiral intermediate of tadalafil[1].Tadalafil is a potent and selective inhibitor of the cyclic guanosime monophosphate(cGMP)-specific phosphor diesterase enzyme,PDE-5.