Synthesis of (±)-karahana ether and karahanaenone by selective cyclization of 6,7-epoxygeranyl acetate
作者:Alejandro F. Barrero、Enrique J. Alvarez-Manzaneda、P.Linares Palomino
DOI:10.1016/s0040-4020(01)89332-7
日期:1994.1
Efficient methods for preparing (±)-karahanaether (1b) and karahanaenine (2) from 6,7-epoxygeranyl acetate(3), by Lewis-acid-catalyzed electrophillic cyclization, are described.
作者:José C. Espinoza-Hicks、Gerardo Zaragoza-Galán、Alejandro A. Camacho-Dávila
DOI:10.2174/1570178620666230825153812
日期:2024.1
starting material, which is converted to the epoxide with m-CPBA and submitted to an anhydrous lithium perchlorate catalyzedrearrangement to the corresponding ketone. Hydrolysis and thermolysis of the ketone afford karahanaenone in good yield. The catalyst can be recycled by simple dehydration and reused without affecting the yield for the rearrangement.