The conjugate reduction of the exocyclic α,β-unsaturated ester 9 with magnesium in methanol gives a mixture of diastereoisomers containing predominantly the less stable 10a. Eventual structural identification rests on the X-ray diffraction analysis of tosylate 18.
环外 α,β-不饱和酯 9 与镁在甲醇中的共轭还原得到主要含有稳定性较差的 10a 的非对映异构体混合物。最终的结构鉴定取决于甲苯磺酸盐 18 的 X 射线衍射分析。