spectroscopies. A methoxycarbonyl group at the chiral C132-position in the ketone was stereo-inverted under basic conditions, whereas those in the corresponding alcoholic and dihydro-forms were not. The in vitro BciC enzymatic reaction of the (132R)-ketone was found to stereoselectively hydrolyze the C132-methoxycarbonyl group, followed by spontaneous decarboxylation. Similarly, the (132R)-COOCH3 group in the
锌甲基pheophorbides一/一个”,其具有氧代和甲氧基羰基基团的C13 1 -和C13 2,分别位上,在上外-five元环熔合它们的二氢卟
酚的π骨架的环状四
吡咯,分别通过
化学修饰来制备在光养植物中产生的叶绿素a的数量。通过还原酮部分合成了C 13 1-羟基化和未取代的类似物。这些半合成化合物的C13 1-和C13 2-立体
化学通过1 H NMR和圆二色性光谱学证实。手性C13 2上的甲氧羰基在碱性条件下,酮的-位是立体反转的,而相应的醇和二氢形式的-位不是。在体外的(13 BCIC酶促反应2 - [R )-酮被发现立体选择性地
水解C13 2 -甲氧基羰基,然后自然脱羧。类似地,(13 2 - [R)-COOCH 3基团在(13 1小号) -醇进行
水解,而(13 2 - [R)-COOCH 3基团在(13 1 - [R )-醇不是。C13 1-二氢化合物进行酶促反应后,其(13观察到2