BiCl<sub>3</sub>-Catalyzed Diastereoselective Intramolecular [4+2] Cycloaddition Reactions Leading to Pyrazole Annulated New Sulfur Heterocycles
作者:Gowravaram Sabitha、Ch. Srinivas Reddy、Ch. Maruthi、E. Venkata Reddy、J. S. Yadav
DOI:10.1081/scc-120022482
日期:2003.9.1
Abstract Intramolecular [4+2] cycloaddition reactions of N-aryl imines generated in situ from anilines and the S-allyl derivatives of pyrazole aldehydes have been carried out in the presence of catalytic amounts of BiCl3 to provide the corresponding hexahydropyrazolo [4′,3′:5,6]thiopyrano[4,3-b]quinolines in excellent yields. The reactions are highly diastereoselective and the only cis products are