V. Mamedov, A. Murtazina, L. P. Sysoeva
Jul 11, 2008
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Journal
Russian Journal of Organic Chemistry
Abstract
Condensation of diethyl 2,4,6-trioxoheptanedioate with 4-methoxy-2-(4-methylphenyliminomethyl)-phenol in acetone gave diethyl 5-hydroxy-9-methoxy-1-(4-methylphenyl)-4-oxo-1,4a,5,10b-tetrahydro-4Hchromeno[ 4,3-b]pyridine-2,5-dicarboxylate as a mixture of diastereoisomers. The major (4aR,5R,10aR)-isomer was isolated as individual substance, and its structure was proved by X-ray analysis.