Synthesis of 7,11-Dienes from Enol Ether and Grignard Reagents Under Nickel Catalysis: Sex Pheromones of<i>Drosophila Melanogaster</i>
作者:Terry L. Davis、David A. Carlson
DOI:10.1055/s-1989-27435
日期:——
A modified Felkin reaction was used to prepare (Z)-4-undecen-1-ol (5) from hexylmagnesium bromide (2) and an enol ether, dihydropyran (3) catalyzed by low-valent nickel species, bis(diphenylphosphino)propanenickel(II) chloride (4). Pyridinium chlorochromate oxidation followed by chromatography afforded (Z)-4-undecenal (6), which was treated with hexadecyltriphenylphosphorane (7b) to yield (Z,Z)-7,11-heptacosadiene (8b). Two homologs (Z,Z)-7,11-pentacosadiene (8a) and (Z,Z) -7,11-nonacosadiene (8c) were also synthesized.
采用改进的Felkin反应,以低价镍物种双(二苯基膦基)丙基镍(II)氯化物(4)为催化剂,由己基溴化镁(2)与烯醇醚二氢吡喃(3)合成得到了(Z)-4-十一碳烯-1-醇(5)。经过吡啶盐氯铬酸盐氧化及色谱分离后,得到了(Z)-4-十一碳烯醛(6),再与十六烷基三苯基膦(7b)反应,制得(Z,Z)-7,11-二十七碳二烯(8b)。同时合成了两个同系物(Z,Z)-7,11-二十五碳二烯(8a)和(Z,Z)-7,11-二十九碳二烯(8c)。