Selective N-7 alkylation of 3-methylhypoxanthine; the first synthesis of malonganenone J
作者:Elahe Jafari Chamgordani、Jan Paulsen、Lise-Lotte Gundersen
DOI:10.1016/j.tetlet.2016.09.078
日期:2016.11
3-Methylhypoxanthine has been reacted with various alkyl halides under basic conditions. Allylic and benzylic halides reacted mostly at N-7 to give dialkylated purines, however, ring-opened imidazole by-products, probably resulting from N-1 alkylation and hydrolysis of the formed salt, were often obtained in minor amounts. Less reactive halides required a larger excess, higher temperatures, and longer
3-甲基次黄嘌呤已在碱性条件下与各种烷基卤反应。烯丙基卤和苄基卤化物大多在N-7反应生成二烷基化嘌呤,但是,开环的咪唑副产物可能是少量的N-1烷基化反应和形成的盐的水解产物。反应性较低的卤化物需要更大的过量,更高的温度和更长的反应时间。3,7-二烷基嘌呤仍然是主要产物,咪唑的生成量很小,但是,也发生了大量的O-烷基化反应。通过3-甲基次黄嘌呤与香叶基香叶基溴的选择性N-7烷基化反应,首次合成了海洋天然产物马龙烯酮J。