Author/Authors :
Yadav، نويسنده , , J.S. and Reddy، نويسنده , , B.V.Subba and Madhuri، نويسنده , , Ch and Sabitha، نويسنده , , G and Jagannadh، نويسنده , , B and Kumar، نويسنده , , S.Kiran and Kunwar، نويسنده , , A.C، نويسنده ,
Abstract :
Lithium tetrafluoroborate efficiently catalyzes an unusual cyclization of o-hydroxybenzaldimines with 2,3-dihydrofuran and 3,4-dihydro-2H-pyran at ambient temperature to afford a class of new pyrano- and furanobenzopyran derivatives in excellent yields with high diastereoselectivity.
Keywords :
o-hydroxyaldimines , lithium tetrafluoroborate , cyclic enol ethers , cis-fused chromans
