Photochemistry synthesis. Part 1: Syntheses of xanthine derivatives by photolysis of 1-(5′-oxohexyl)-3,7-dimethyl-3,7-dihydro-1H-purine-2,6-dione (pentoxifylline): an ambident chromophore
作者:Ze Han、Susan L. Bonnet、Jan H. van der Westhuizen
DOI:10.1016/j.tet.2008.01.007
日期:2008.3
pentoxifylline. Under conditions that favour singlet excited states, we obtained 1-allyl-3,7-dimethyl-3,7-dihydro-1H-purine-2,6-dione, (R∗,R∗)-(±)-1-[2-hydroxy-2-methylcyclobutyl]methyl}-3,7-dimethyl-3,7-dihydro-1H-purine-2,6-dione and 1-(5-hydroxyhexyl)-3,7-dimethyl-3,7-dihydro-1H-purine-2,6-dione. Naphthalene or molecular oxygen increases the yields and triplet sensitisers (acetophenone, benzophenone and acetone)
我们调查了使用光化学来制备己酮可可碱的新型衍生物。在有利于单线态激发态的条件下,我们获得了1-烯丙基-3,7-二甲基-3,7-二氢-1 H-嘌呤-2,6-二酮((R ∗,R ∗)-(±)-1 -[[2-羟基-2-甲基环丁基]甲基} -3,7-二甲基-3,7-二氢-1 H-嘌呤-2,6-二酮和1-(5-羟基己基)-3,7-二甲基-3,7-二氢-1 H-嘌呤-2,6-二酮。萘或分子氧增加了收率,三重态敏化剂(苯乙酮,二苯甲酮和丙酮)降低了收率。从羰基到黄嘌呤部分的有效分子内三重态能量转移使羰基部分仅从单重态激发态起反应。在具有α-羟烷基氢的溶剂中,需要三重激发态的条件下,我们获得了8个取代的五氧杂环丁烷基衍生物:8-(1-羟基-1-甲基乙基)-3,7-二甲基-1-(5-氧己基)-异丙醇中的3,7-二氢-1 H-嘌呤-2,6-二酮8-(1-羟甲基)-3,7-二甲基-1-(5-氧代己基)-3,7