Rodríguez-Solla H, Concellón C, Blanco EG, Sarmiento JI, Díaz P, Soengas RG. Chromium-mediated stereoselective synthesis of carbohydrate-derived (E)-α,β-unsaturated esters or amides.
J Org Chem 2011;
76:5461-5. [PMID:
21612264 DOI:
10.1021/jo200548g]
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Abstract
A chromium-mediated novel synthesis of carbohydrate-derived di- and trisubstituted (E)-α,β-unsaturated esters or amides from a range of dichloroesters or amides and a variety of sugar aldehydes is reported. The process took place with total stereoselectivity and in high yields. A mechanism based on a sequential chromium-promoted aldol-type reaction and a completely stereoselective β-elimination reaction is proposed to explain these results.
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