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■ Regioselective Reduction of N-Alkyl-3-sulfonyl Glutarimide. Formal Synthesis of 1,2,3,4,6,7,12,12b-Octahydroindolo[2,3-a]quinolizine and Homobaclofen

Meng-Yang Chang and Shui-Tein Chen*

*Institute of Biological Chemistry, Academia Sinica, 128, Yan-Chiu-Yuan Road, Sec II, NanKang, Taipei, 11529, Taiwan, R.O.C.

Abstract

Reduction of N-alkyl-3-sulfonylglutarimides with (1) sodium hydride and then with lithium aluminum hydride, or (2) sodium borohydride yielded two different types of regioselectively reduced hydroxypiperidinones which were further dehydrated to two pyridin-2-ones in the presence of boron trifluoride etherate. Cycloaddition and regioselective reduction were combined to synthesize 1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizine and homobaclofen.