Chloride → tert-Butyl 2,4-dideoxy-3,5-O-(1-methylethylidene)-D-erythro-hexonate

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Solid tetrabutylammonium benzoate obtained as above (126.47 g, 0.348 mole) was added in one portion to a mechanically stirred solution of the chloride (4R-cis)-6-(chloromethyl)-2,2-dimethyl-1,3-dioxane-4-acetic acid, 1,1-dimethylethyl ester prepared as in step (d) of Example 1 above (32.3 g, 0.116 mole) in HPLC grade 1-methyl-2-pyrrolidinone (465 ml) under argon. The resulting solution was stirred at 100° C. (internal temperature). After 30 to 60 minutes the reaction mixture became homogeneous and brown in color. The progress of the reaction was followed by TLC and GC analysis (TLC: Rf =0.47 for the chloride starting material; Rf =0.35 for the title compound (silica gel, Ether: Hexane, 4:6, visualization by Ce (SO4 )2 spray). After 6.5 hours the reaction was completed.

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