A straightforward synthesis of glyco-2,7- and 2,8-dienes

Abstract 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- O -trimethylsilyl- d - gluco -nona-2,8-dienoate 19 with satisfying yield.