Synthesis of optically pure tetrahydrofurans from 2-o-allylglucose derivatives by intramolecular nitrone cycloaddition: preferential formation of a furanoisoxazolidine from penta-o-allylglucose
作者:Ranjan Mukhopadhyay、Asish P. Kundu、Anup Bhattacharjya
DOI:10.1016/0040-4039(95)01566-z
日期:1995.10
Intramolecularnitronecycloaddition of 2-O-allyl-3,5,6-tri-O-benzylglucose and penta-O-allylglucose afforded opticallypure trisubstituted tetrahydrofurans.
Intramolecular 1,3-dipolar nitrone and nitrile oxide cycloaddition of 2- and 4-O-allyl and propargyl glucose derivatives: a versatile approach to chiral cyclic ether fused isoxazolidines, isoxazolines and isoxazoles
作者:Subir Ghorai、Ranjan Mukhopadhyay、Asish P. Kundu、Anup Bhattacharjya
DOI:10.1016/j.tet.2005.01.119
日期:2005.3
demonstrated the preferred formation of a five-memberedring to that of six or seven-membered rings. The nitrile oxide generated from a 3,4,5,6,7-pentaallyloxy-1-nitroheptane derivative obtained from pentaallylglucose underwent diastereoselective cycloaddition to give an isoxazoline fused to a pyran ring. Enantiopure isoxazoles containing tetrahydrofuran and oxepane rings were also prepared in good