Abstract
A convenient and novel route for the stereoselective synthesis of 3,5-Di-O-benzoyl-2-deoxy-2-chloro-2-C-methyl-ᴅ-ribono-γ-lactone 5a and its analogues is developed by an Evans-Aldol reaction in the presence of TiCl4. Starting from 2-chloropropionyl chloride, 5a is efficiently and regioselectively produced on a kilogram scale in an overall yield of 32% with an HPLC purity of 98% by area. In addition, this approach allowed an efficient synthesis of 3,5-Di-O-benzoyl-2-deoxy-2-fluoro-2-C-methyl-ᴅ-ribono-γ-lactone 5b in a total 20% yield.
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