Abstract:<p>A range of unnatural carbohydrates (sugars) with an unusual 2-C-bromomethylene branch have been synthesised by reaction of the 1,2-cyclopropanated carbohydrate 52 with different nucleophiles. Initial work to optimise the cyclopropane ring opening in the presence of sodium allyloxide/allyl alcohol provided anomers 140 and 141 in up to 75% yield. Use of sodium thiophenolate/thiophenol provided anomeric thioglycosides 181 and 182 (76% yield, 7:2 ratio), while sodium diethylamide/ diethylamine provided an… Show more
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