作者:Michael T. Huggins、David A. Lightner
DOI:10.1021/jo010525p
日期:2001.12.1
C-8 engage only in intermolecular hydrogen bonding, 1 is found to engage in intramolecular hydrogen bonding. In CDCl(3) solution, dipyrrinone 1 adopts an anti-Z conformation, and its hexanoic acid COOH is hydrogen-bonded to the lactam H-N-C=O and to the pyrrole C(7)-H but not to the pyrrole NH. The latter constitutes an example of a hydrogen bond of the type C-H...O=C, weak and detected typically in
(4Z)-8-(5-羧戊基)-9-丁基-2,3-二乙基-二吡喃-1-酮(1)是一种新的黄胆红酸类似物(4Z)-8-(羧乙基)-2,从已知的2,3-二乙基-二吡啶-1-酮以四个步骤合成了7,9-二甲基-3-乙基-二吡啶-1-酮。而黄胆红酸(这是胆红素的一半,黄疸的黄色色素的模型)及其与己酸和较长酸链在C-8的同系物仅参与分子间氢键,而发现1参与分子内氢键。 。在CDCl(3)溶液中,二吡啶酮1具有抗Z构象,其己酸COOH与内酰胺HNC = O和吡咯C(7)-H氢键合,但与吡咯NH氢键合。后者构成CH ... O = C类型的氢键的一个例子,该氢键弱并且通常在晶体中检测到。