摘要:
Oxidation of isobenzofuranone 1 yielded in a diastereoselective reaction epoxide 2. Acidolysis of 2 resulted in a mixture of trans-glycols 6 a (88%) and 7 a (4%), which were separated by crystallization. The relative configuration of 6 a and 7 a at the chiral centers 3 a, 5, 6, and 7 a was determined by H-1-NMR-spectroscopy and X-ray analysis of O-acetylated and 7 a-methylated derivatives.