Stereospecific total synthesis of (+)-ε- and (-)-γ2-cadinene
作者:Lâle Aka Burk、Milton D. Soffer
DOI:10.1016/0040-4020(76)85113-7
日期:——
(+)-ε-Cadinene (1) and (-)-γ2cadinene (2) have been synthesized from the enol ether ketone 3 via the methylene ketone 4. These two stereospecific total syntheses confirm the structures assigned to these sesquiterpenes and represent the first preparation by totally synthetic methods of any of the widespread group of cadinanes in their native state.
A total synthesis of (±)γ2-cadinene is described. The synthetic terpene was characterized by conversion to (±)-cadinene dihydrochloride.
描述了(±)γ2-卡丁烯的全合成。该合成萜烯通过转化为(±)-卡丁烯二盐酸盐进行表征。
Vig, O. P.; Sharma, M. L.; Taneja, K. C., Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, <hi>1981</hi>, vol. <B> 20, # 11, p. 972 - 973
作者:Vig, O. P.、Sharma, M. L.、Taneja, K. C.、Verma, N. K.
of synthetically useful reactions of 2-trimethylsilylmethyl-1,3-butadiene (7) are discussed. Reactions of 7 with acid chlorides, aldehydes, ketones and acetals activated by a Lewis acid give isoprenylated compounds, while 7 undergoes the Diels-Alderreaction with dienophiles. High regiospecificity of the reaction qualifies 7 for a versatile building block of terpene synthesis.
A new sesquiterpene hydrocarbon, (−)γ2-cadinene, has been isolated from Indian vetiver oil. On the basis of formation of (+) cadinene dihydrochloride and other reactions, its structure and absolute configuration are represented by the formula I. It belongs to the unusual antipodal group of cadinenes.