Facile synthesis of 3-spiropyrrolizidine oxindoles and 3-spirotetrahydroquinoline oxindoles via [3+2] and [4+2] cycloaddition reactions

A.Sudhakara, H.C.Kiran Kumar,

Abstract

A rapid and efficient synthesis of a number of functionalized 3- spiropyrrolizidine oxindoles from[3+2] cycloaddition of azomethine ylide and 3-spirotetrahydroquinoline oxindoles from[4+2] imino Diels-Alder reaction; catalyzed byAntimony(III)chloride in excellent yields are reported.