A facile and efficient route to the bicyclo[3.2.1]octane system. Application to the enantioselective approach to cyclopentanoids
作者:Hiroshi Kosugi、Junichiro Sugiura、Michiharu Kato
DOI:10.1039/cc9960002743
日期:——
The reaction of (4R,5R)-1-acetoxy-4-(1,2-epoxy-1-methyl-ethyl)-5-methylcyclohex-1-ene 8 with BF3·Et2O provides, in one chemical operation, (1R,4R,5R,7S)-7-acetoxy-4,6-dimethylbicyclo[3.2.1]octan-2-ones 9a,b which are then transformed to (2R,3R)-2-methyl-3-[(R)-1-methyl-3-oxobutyl]-cyclopentanone 16 with the same absolute configuration as that of the steroid D ring.
(4R,5R)-1-乙酰氧基-4-(1,2-环氧-1-甲基-乙基)-5-甲基环己-1-烯 8 与 BF3-Et2O 的反应在一次化学反应中生成 (1R,4R,5R,7S)-7-乙酰氧基-4,6-二甲基双环[3.2.1]辛烷-2-酮 9a、b,然后将其转化为(2R,3R)-2-甲基-3-[(R)-1-甲基-3-氧代丁基]-环戊酮 16,其绝对构型与类固醇 D 环相同。