Base-promoted new C–C bond formation: an expedient route for the preparation of thiazolo- and imidazolo-pyridinones via Michael addition
摘要:
Base-catalyzed one-pot cyclocondensation reactions of acryloyl and cinnamoyl chlorides with beta-nitroenamine derivatives have been performed under mild conditions and target 7-substituted thiazolo-[3,2-alpha] or imidazolo-[1,2-alpha]pyridin-5-one derivatives were prepared successfully in moderate to good yields. The cyclization reactions may proceed via Michael addition followed by iminoketene-amide tautomerization in view of the products formed. (C) 2014 Elsevier Ltd. All rights reserved.