Synthesis of some heterocyclic spirocompounds

1,3-Dipolar cycloaddition reactions of methylenepyrrolidinones with nitrilimines or nitrones resulted in regio and stereoselective formation of respective spiropyrazolines or spiroisovazolidines.Department of Organic Chemistry, Slovak Technical University, Radlinského 9, 81237 Bratislava, Slovak Republic. Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1353–1355, October, 1995. Original article submitted August 24, 1995.