Stereochemical studies on the Uncaria alkaloid, 3-oxo-7-hydroxy-3,7-secorhynchophylline: The absolute configuration of 3-hydroxyoxindole derivatives
作者:Hiromitsu Takayama、Toshikazu Shimizu、Hiroyuki Sada、Yuriko Harada、Mariko Kitajima、Norio Aimi
DOI:10.1016/s0040-4020(99)00337-3
日期:1999.5
found in Uncaria attenuata, was prepared from isorhynchophylline (2), and two diastereomers ascribable to C7 of the natural and semi-synthetic 1 were separated by chiral column chromatography. The absolute configuration at C7 was elucidated by comparison of the CD spectra with those of the known oxytryptophan derivatives (8a and 8b). Further, the absolute configuration of some natural products having
用异胆碱碱(2)制备3-Oxo-7-hydroxy-3,7-secorhynchphylline(1),一种从钩藤碱(2)制备的羟吲哚生物碱,并分离了天然和半合成1的C7引起的两种非对映异构体。手性柱色谱。通过将CD光谱与已知的氧色氨酸衍生物(8a和8b)的CD光谱进行比较,阐明了在C7的绝对构型。此外,通过利用本研究中获得的新的CD光谱发现,推论了某些具有3-取代-3-羟基羟吲哚部分的天然产物的绝对构型。