The Biogenetic-Type Cyclization of the Unsaturated Monocyclic Alcohol with Formic Acid; Facile Synthesis of the Tricarbocyclic Alcohol, (+)-2-Epi-allo-cedrol
作者:Koichiro Naemura、Tomoyuki Hasegawa、Hajime Miyabe、Hiroaki Chikamatsu
DOI:10.1246/bcsj.65.203
日期:1992.1
The biogenetic-type cyclization of (+)-(3S)-2-(3-hydroxy-3-methyl-4-pentenyl)-1-methyl-3-(1-methylethenyl)cyclopentene, prepared from d-limonene, with formic acid gave stereo and regiospecifically the formates of the tricyclic compounds of the allo-cedrol skeleton, hydrolysis of which gave the unsaturated alcohols, (+)-(1S,5R,7R,8S)-2,6,6,7-tetramethyltricyclo[5.2.2.01,5]undec-2-en-8-ol (27) and (+)-(1S,5R,7R,8R-2,6,6,7-tetramethyltricyclo[5.2.2.01,5]undec-2-en-8-ol. Hydrogenation of 27 gave (+)-(1R,2S,5R,7R,8S)-2,6,6,7-tetramethyltricyclo[5.2.2.01,5]undecan-8-ol, (+)-2-epi-allo-cedrol.
用甲酸水解可得到烯丙基柏木醇骨架的三环化合物的立体和特定的甲酸酯,水解后可得到不饱和醇,即 (+)-(1S,5R,7R,8S)-2,6,6,7-四甲基三环[5.2.2.01,5]undec-2-en-8-ol (27) and (+)-(1S,5R,7R,8R-2,6,6,7-tetramethyltricyclo[5.2.2.01,5]undec-2-en-8-ol.27 的氢化反应得到了 (+)-(1R,2S,5R,7R,8S)-2,6,6,7-四甲基三环[5.2.2.01,5]十一碳-8-醇、(+)-2-表烯-8-醇。