A rapid synthesis of mono- and bis-tetrahydropyrazolo[4′,3′:5,6]thiopyrano[4,3-b]quinolines has been achieved by the reaction of aldimines derived from aromatic amines and S-prenylated aldehydes in acetonitrile with InCl3 as a catalyst, in excellent yields and short reaction times, under mild conditions.
通过衍生自芳族胺的醛亚胺和S-异戊醛化的乙醛在乙腈中与乙醛反应,可以快速合成单-和双-四氢吡唑并[4',3':5,6]硫代吡喃并[4,3- b ]喹啉InCl 3作为催化剂,在温和条件下具有极佳的收率和较短的反应时间。
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