A straightforward synthesis of glyco-2,7- and 2,8-dienes
摘要:
In this paper, we report the efficient preparation of carbohydrate-derived 2,7- and 2,8-dienes. By our synthetic approach, we have quickly converted D-glucose 1 to (E)-ethyl-2,3-dideoxy-D-gluco-oct-2-enoate 5, which led to the desired (E)-ethyl-9,9-dibromo-2,3,8,9-tetradeoxy-4,5,6,7-tetra-(E)-trimethylsilyl-D-gluco-nona-2,8-dienoate 19 with satisfying yield. (c) 2006 Elsevier Ltd. All rights reserved.
A novel general route to higher aldoses is proposed involving transformation of the starting monosaccharides-2,3-dehydro-2-3-dideoxyaldonic acid or to its ester, by Knoevenage-Doebner condensation or Wittig reaction, folowed by double bond hydroxylation to give higher aldonic acids. The acids are reduced to the corresponding aldoses by conventional methods.