PREPARATION OF NEW NITROGEN-BRIDGED HETEROCYCLES. 8. SYNTHESES OF SOME FUSED INDOLIZINE DERIVATIVES VIA THE ACID-CATALYZED CYCLIZATIONS OF FUNCTIONALIZED 1- AND 3-VINYLINDOLIZINES.

Article abstract of DOI:10.1246/bcsj.57.548

Pyrano left bracket 3,2-a right bracket and pyranol left bracket 2,3-b right bracket indolizin-2-one derivatives were prepared in 12-86% yields by the acid-catalyzed deacetylation-cyclization of 2-acetoxy-1- and 3- left bracket 2-(ethoxycarbonyl)vinyl rig