作者:Stefan E. Boiadjiev、David A. Lightner
DOI:10.1021/jo030091t
日期:2003.10.1
Three regioisomeric bilirubins and biliverdins with propionic acids replaced by benzoic acids were synthesized from the corresponding xanthobilirubic acids by oxidative coupling. The rubins were found to exhibit widely varying polarity, spectroscopic properties, and stereochemistry. The isomer with ortho benzoic acids (1o) was much less polar than either the meta (1m) or para (1p) because 1o (but not
通过氧化偶合从相应的黄胆红酸合成了三种丙酸被苯甲酸取代的区域异构胆红素和胆绿素。发现红宝石显示出广泛变化的极性,光谱性质和立体化学。具有邻苯甲酸(1o)的异构体极性比间位(1m)或对位(1p)低得多,因为1o(但不是1m和1p)可以采用两种分子内氢键合到相对二吡啶酮上的羧酸折叠构型。在不同的1H NMR,UV-vis和圆二色性光谱特性中发现了这种构象差异的结果。