Abstract
Various optically active δ-ketobutanolides were easily prepared in good yields, with an excellent enantiomeric purity, by acylation of organomanganese reagents with the butyrolactone acid chloride 3 prepared from natural ( l)-glutamic acid. The reaction takes place in THF under mild conditions (−10°C, 3h or 3% CuCl, −30°C, 20 min.).
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