Synthesis of Natural Oxygenated Monocarbocyclic Sesquiterpenoids from 6,7-Epoxygeranyl Acetate
作者:Alejandro F Barrero、Enrique J Alvarez-Manzaneda、Rachid Chahboun、A Rodriguez Rivas、P Linares Palomino
DOI:10.1016/s0040-4020(00)00560-3
日期:2000.8
Natural sesquiterpenes 5-(2/,5'-epoxy-2',6',6'-trimethyl)cyclohexyl-3-methyl-1-penten-3-ol (5), cis-3-[(E)-5'-hydroxy-3'-methyl-3'-pentenyl]-2,2-dimethyl-4-methylenecyclohexanol (elegansidiol) (6), 4-(5'-acetoxy-2',6',6'-trimethyl)cyclohex-2'-enyl-3-methyl-1-penten-3-ol (7) and 5-acetoxy-3-(3-hydroxy-3-methylpent-4-enyl)2,4,4-trimethylcyclohex-2-enone (8) were prepared from 6,7-epoxygeranyl acetate (9), via (2',5'-epoxy-2',6',6'-trimethyl)cyclohexylmethyl tosylate (10), for the first time. 5 is an intermediate in the synthesis of the sesquiterpene-coumarin ether (+/-)-farnesiferol C (1). The preparation of suitable intermediates for synthesising related natural farmesiferol B (3) and D (4) is also reported. (C) 2000 Elsevier Science Ltd. All rights reserved.