[2.2.1]-Bicyclic systems relevant to synthetic studies on CP-225,917—use of a new silylated cyclopentadiene
作者:Derrick L.J Clive、Hua Cheng、Pulak Gangopadhyay、Xiaojun Huang、Bodhuri Prabhudas
DOI:10.1016/j.tet.2004.03.042
日期:2004.5
The [2.2.1]-bicyclic ketone 6, a potential synthetic precursor to CP-225,917, was prepared by a sequence beginning with Diels–Alder reaction between dimethyl fumarate and the silylated cyclopentadiene 38. The adduct 40 was subjected to Tamao–Fleming oxidation, which converted it into alcohol 21. During the oxidation BF3·Et2O–AcOH was used instead of the more expensive BF3·2AcOH complex. Alcohol 21
[2.2.1]-双环酮6是CP-225,917的潜在合成前体,其制备顺序是从富马酸二甲酯与甲硅烷基化的环戊二烯38之间的Diels-Alder反应开始的。加合物40经过Tamao-Fleming氧化,将其转化为酒精21。在氧化过程中,使用了BF 3 ·Et 2 O-AcOH代替了较昂贵的BF 3 ·2AcOH络合物。将醇21精制为6,它带有CP-225,917的侧链之一,以及其他适合进一步精制的取代基。