S. Gabriels et al., On the unexpected stereochemical outcome of the magnesium in methanol - Conjugate reduction of an exocyclic alpha,beta-unsaturated ester, EUR J ORG C, (8), 1999, pp. 1803-1809
The conjugate reduction of the exocyclic alpha,beta-unsaturated ester 9 wit
h magnesium in methanol gives a mixture of diastereoisomers containing pred
ominantly the less stable 10a. Eventual structural identification rests on
the X-ray diffraction analysis of tosylate 18.