作者:Guido Nuding、Edgar Zimmermann、Volker Buss
DOI:10.1016/s0040-4039(01)00240-4
日期:2001.4
rac 4a-methyl-2,3,4,4a-tetrahydro-1H-carbazole (3) with 1,1,3,3-tetraethoxypropane. The configuration of the dye is 2Z,8E,9E,10E,9′E,8′Z as shown by 1H NMR spectroscopy. Starting with the enantiomerically pure carbazole (95% e.e.) the optically active pentamethine 5a was obtained in 84% optical yield. The CD absorption of 5a at 653 nm indicates a significant helical distortion of the chromophore.
通过将rac 4a-methyl-2,3,4,4a-tetrahydro-1 H-咔唑(3)偶联至双[1,3-二甲基-3,8-(三亚甲基)-吲哚基]戊二碘碘化物(5)1,1,3,3-四乙氧基丙烷。染料的配置是2 Ž,8 ê,9 ê,10 ê,9' ê,8' ž如图1个H NMR光谱。从对映体纯的咔唑(95%ee)开始,以84%的光学收率得到旋光性戊甲胺5a。5a在653 nm处的CD吸收表明发色团发生明显的螺旋形扭曲。