Stereoselective Synthesis of (3R)-3,4-Dihydro-6,8-dimethoxy-3-undecyl- 1H-[2]benzopyran-1-one and Derivatives, Metabolites from Ononis natrix
作者:Aamer Saeed
DOI:10.1002/hlca.200390038
日期:2003.2
A short stereoselective synthesis of (3R)-3,4-dihydro-6,8-dimethoxy-3-undecyl-1H-[2]benzopyran-1-one and derivatives isolated from Ononis natrix has been described. Condensation of dodecanoyl chloride with 3,5-dimethoxyhomophthalic acid afforded 6,8-dimethoxy-3-undecylisocoumarin 3, which, on sequential saponification and esterification, yielded the keto ester 5. Enantioselective reduction of 5 with
已经描述了(3 R)-3,4-二氢-6,8-二甲氧基-3-十一烷基-1 H- [2]苯并吡喃-1-酮和从Ononis natrix分离的衍生物的短立体选择性合成。将十二烷酰氯与3,5-二甲氧基高邻苯二甲酸缩合,得到6,8-二甲氧基-3-十一烷基异香豆素3,经连续的皂化和酯化反应,生成酮酸酯5。用TarB-NO 2 / LiBH 4对映体选择性还原5,直接得到标题为二氢异香豆素1a的80%ee(产率为82%)。后者的部分或完全脱甲基提供了二氢异香豆素1b和1c分别。还描述了立构中心(C(3))两侧的CH 2 H原子的非对映异构性和二氢异香豆素的质量碎片化模式。在体外检查所有合成的化合物的抗真菌活性。