?-Cleavage of Potassium Bicyclo[2.2.2]oct-5-en-2-olates. Stereoselective synthesis of (�)-trichodiene
作者:Roger L. Snowden、Robert Brauchli、Philippe Sonnay
DOI:10.1002/hlca.19890720318
日期:1989.5.3
3-(cyclohex-3-enyl)-2-alkanones (III or IV), via β-cleavage of their potassium alkoxides in HMPA, has been investigated (cf. Table 1). As an illustration of this synthetic methodology, a stereoselective synthesis of (±)-trichodiene ((±)-1) is described which involves the β-cleavage of the tricyclic potassium alkoxides 46a and 47a to cyclopentanone 4 (cf. Scheme 7).
的变换12双环[2.2.2]辛-5-烯-2-醇(V或VI)到3-(环己-3-烯基)-2-烷酮(III或IV),经由的β裂解其已经研究了HMPA中的醇钾盐(参见表1)。作为该合成方法的说明,描述了(±)-三茂二烯((±)-1)的立体选择性合成,该合成涉及将三环烷氧基钾46a和47a裂解为环戊酮4(参见方案7)。