Highly Stereoselective Synthesis of Trisubstituted<i>γ</i>,<i>δ</i>-Unsaturated Acid and Aldehyde<i>via</i>Ketal Claisen Rearrangement
作者:Hisao Takayanagi、Yasuhiro Morinaka
DOI:10.1246/cl.1995.565
日期:1995.7
A new sequence for the highly stereoselective (E>99%) synthesis of a trisubstituted γ,δ-unsaturated acid (3), which consists of a ketal Claisen rearrangement of a terpene allylicalcohol with 2,2-dimethoxy-3-methyl-3-butanol and a subsequent oxidative cleavage of the resulting α-ketol, is applicable even to the preparation of 3 which is difficult to synthesize by traditional methods. The related procedure