作者:R. Klok、G. J. N. Egmond、H. J. J. Pabon
DOI:10.1002/recl.19740930806
日期:——
Large-scale syntheses of 19-cis-docosenoic, 17-cis-eicosenoic and 15-cis-octadecenoic acid by chain extension of 8-undecynoic acid via Kolbe's anodic synthesis, as well as by coupling of 1-butyne with n-bromoalkanoic acids were found unsuitable. Therefore, 15-octadecynoic acid was prepared on a large scale from 13-hexadecyn-1-ol by malonic ester coupling. Esterification and reduction with lithium aluminium
通过Kolbe的阳极合成方法,通过8-十一碳烯酸的扩链,以及通过将1-丁炔与正溴代链烷酸偶合,大规模合成19-顺-二十二碳酸,17-顺-二十碳烯酸和15-顺-十八碳烯酸被发现不合适。因此,通过丙二酸酯偶联从13-十六炔-1-醇大规模制备15-十八碳烯酸。用氢化锂铝进行酯化和还原,得到15-十八碳烯-1-醇。将后者转化为甲磺酸酯,然后合成丙二酸酯,得到17-二十碳五烯酸,然后通过相同的反应步骤顺序将其转化为19-二十二碳五烯酸。在Lindlar催化剂存在下,乙炔酸的氢化反应产生标题化合物。