PYRROLIZIDINE ALKALOIDS. THE ABSOLUTE CONFIGURATIONS OF LATIFOLIC ACID AND ITS STEREOISOMERS
作者:Takashi Matsumoto、Tetsuaki Okabe、Kenji Fukui
DOI:10.1246/cl.1973.773
日期:1973.8.5
The absolute configurations of latifolic acid (IVa) and its stereoisomers (IVb, Va, and Vb) have been elucidated. (S)(+)-3-Methoxycarbonyl-2-methyl-cis-3-pentenoic acid (VIIIa), correlated to (S)(−)-2-methyl-1,4-butanediol (XII), was converted to latifolic acid (IVa: 2S,3S,4R) and Va (2S,3R,4S). Similarly, the enantiomer (VIIb) was also converted to IVb (2R,3R,4S) and Vb (2R,3S,4R). The CD spectra
阔叶酸 (IVa) 及其立体异构体 (IVb、Va 和 Vb) 的绝对构型已经阐明。(S)(+)-3-Methoxycarbonyl-2-methyl-cis-3-pentenoic acid (VIIIa),与 (S)(-)-2-methyl-1,4-butanediol (XII) 相关,被转化为阔叶酸 (IVa: 2S,3S,4R) 和 Va (2S,3R,4S)。同样,对映异构体 (VIIb) 也转化为 IVb (2R,3R,4S) 和 Vb (2R,3S,4R)。还检查了这些丁内酯的 CD 光谱。