readily available, 1,19 dibromo-ac-biladiene dihydrobromide salts 3 with dimethyl sulfoxide (DMSO) in presence of a catalytic amount of toluene-p-sulfonic acid affords symmetrical and unsymmetrical biliverdins 4 in excellent yield; unsymmetrically substituted 1,19 dibromo-ac-biladiene dihydrobromide 3c was prepared in a stepwise fashion via a tripyrrin salt. Under appropriate reaction conditions, the ac-biladiene
容易得到的,1,19二
溴治疗交流-biladiene二
氢溴酸盐3用
二甲亚砜(
DMSO)中
甲苯和催化量的存在p
磺酸得到对称和不对称biliverdins 4的优良率; 不对称取代的1,19二
溴交流-biladiene二
氢溴酸盐3c中被以逐步的方式制备经由一个tripyrrin盐。在适当的反应条件下,交流-biladiene dihydrobromides也转换在适度的产率到corroles 5和氮杂
卟啉6。