Novel halo-oxo-allenic fatty ester derivatives from epoxidized methyl santalbate (methyl trans-11-octadecen-9-ynoate)
作者:M.S.F Lie Ken Jie、M.M.L Lau、C.N.W Lam、M.S Alam、J.O Metzger、U Biermann
DOI:10.1016/s0009-3084(03)00071-9
日期:2003.10
gave the anti-chlorohydrin derivative (3) (89%). Oxidation of either compound 2a or 2b gave the same fluoro-keto acetylenic fatty ester (4) (75%), and compound 3 on chromic acid oxidation yielded the corresponding chloro-keto acetylene (5) (73%). Isomerization of compounds 4 and 5 with potassium carbonate in dichloromethane furnished the requisite fluoro-allenic (6) (63%, methyl 11-fluoro-12-oxo-9,10-octadecadienoate)
将檀香木种子油(Santalbum明矾)中的檀酸甲酯(trans-11-octadecen-9-ynoate甲基)环氧化为trans-11,12-epoxy-octadec-9-ynoate(1)。用三氟化四丁基铵和三氟化硼醚化物处理化合物1,分别得到相应的抗-(2a)(57%)和合-(2b)(35%)氟代醇衍生物。这些反应本质上是区域和立体选择性的。通过NMR光谱证实了反异构体和同分异构体的结构。用氯化锂将化合物1的环氧体系开环,得到抗氯醇衍生物(3)(89%)。化合物2a或2b的氧化得到相同的氟-酮炔属脂肪酸酯(4)(75%),铬酸氧化时的化合物3得到相应的氯-酮乙炔(5)(73%)。用二氯甲烷中的碳酸钾将化合物4和5异构化,提供了所需的氟代allenic(6)(63%,11-氟代-12-氧代-9,10-十八碳烯酸甲酯)和氯代allenic(7)(80%,甲基11-氯-12-氧代9,1