Synthesis of 24 Bacteriochlorin Isotopologues, Each Containing a Symmetrical Pair of <sup>13</sup>C or <sup>15</sup>N Atoms in the Inner Core of the Macrocycle
作者:Chih-Yuan Chen、David F. Bocian、Jonathan S. Lindsey
DOI:10.1021/jo402488n
日期:2014.2.7
triethyl (13C)orthoformate (5, 15); K13CN (6, 16); 13CH3NO2 (9, 19); N,N-dimethyl(13C)formamide (10, 20); (15N)pyrrole (21, 23); CH315NO2 (22, 24). Some loss of 15N upon TiCl3-mediated McMurry-type ring closure of a nitro(15N)hexanone is attributed to a parallel sequence of three reactions (Nef, exchange with natural-abundance NH4OAc buffer, and Paal–Knorr ring closure) leading to the dihydrodipyrrin–acetal
含有位点特异性同位素取代的合成菌绿素能够通过光谱分析来描绘光合作用中与细菌叶绿素相关的物理化学特征,但对此进行了很少的探索。已采用从头合成来制备菌绿素,其中每个大环含有一对13个C或15个N原子,但在每个吡咯啉环中缺乏除偕二甲基之外的取代基。制备具有单同位素取代的二氢二吡林缩醛可产生含有两个同位素取代的菌绿素,这些同位素取代围绕大环平面的法线对称地旋转 180°。八种这样的同位素取代的菌绿素由市售反应物(菌绿素位点)制备:(13 C)多聚甲醛(1, 11);( 13 C )甲酰胺(4, 14); ( 13 C )原甲酸三乙酯 (5, 15); K 13 CN (6, 16); 13 CH 3 NO 2 (9, 19); N,N-二甲基( 13 C )甲酰胺(10, 20); ( 15 N )吡咯 (21, 23); CH 3 15 NO 2 (22, 24)。TiCl 3介导的硝基(15 N