作者:Simon Fielder、Daryl D. Rowan
DOI:10.1002/jlcr.2580341111
日期:1994.11
D6-α-Farnesene (3,7-dimethyl-11-2H3-methyl-12,12,12-2H3-dodeca-1,3E,6E,10-tetraene) has been synthesised by two routes. Thermolysis of 2-geranyl-3-methylsulpholene (5) yielded unlabelled α-farnesene (93%) which was epoxidized at Δ10 in 31% yield. Oxidative cleavage of the epoxide (42%) and Wittig elaboration of the resultant trienal with d6-isopropyl triphenylphosphorane gave d6-α-farnesene (73%). Alternatively, selective epoxidation of (5) gave the terminal 6′,7′ mono-epoxide in 74% yield. Oxidative cleavage (73%) and Wittig elaboration of the resultant aldehyde yielded deuterated 2-geranyl-3-methylsulpholene (46%). Thermal elimination of sulphur dioxide afforded the title compound in 91% yield.
D6-α-法呢烯(3,7-二甲基-11-2H3-甲基-12,12,12-2H3-十二碳-1,3E,6E,10-四烯)可通过两种途径合成。2-香叶基-3-甲基硫醇(5)的热解可生成未标记的α-法呢烯(93%),后者在Δ10处发生环氧化反应,产率为31%。环氧化物的氧化裂解(42%)和Wittig反应生成的三烯醇与d6-异丙基三苯基膦的反应可生成d6-α-法呢烯(73%)。另一种方法是选择性地使(5)发生环氧化反应,生成末端6′,7′单环氧化物,产率为74%。氧化裂解(73%)和Wittig反应生成的醛可生成氘代2-香叶基-3-甲基硫醇(46%)。二氧化硫的热消除反应可生成标题化合物,产率为91%。