Efficient Total Syntheses of Natural Neopterin Glycosides: Neopterin Glucronide and Solfapterin
作者:Tadashi Hanaya、Katsuya Iwasaki、Kaori Saeki、Takafumi Hattori
DOI:10.3987/com-16-s(s)32
日期:——
opterin derivative (23a) in 58% yield. The first syntheses of neopterin glucronide (5) and solfapterin (6) were achieved by successive removal of the protecting groups of 18 and 23a, respectively. INTRODUCTION Pterin glycosides having various kinds of sugars attached to the side-chain at C–6 of the pteridine ring were found to be produced by certain prokaryotes such as cyanobacteria and anaerobic photosynthetic
1',2'-二-O-乙酰基-N2-(N,N-二甲基氨基亚甲基)-3-[2-(4-硝基苯基)乙基]新蝶呤(11a)及其1',2'-二-O-苯甲酰类似物 (11b) 分别由新蝶呤分 5 步制备。在三氟甲磺酸银存在下,用 2,3,4-三-O-苯甲酰基-D-吡喃葡萄糖基糖醛酸甲酯溴化物 (15b) 对 11a 进行糖基化,得到相应的 3'-O-(-D-吡喃葡萄糖基)新蝶呤衍生物 (18) 64% 的收率。用 2-叠氮基-3,4,6-三-O-苯甲酰基-2-脱氧-α-D-吡喃葡萄糖基溴 (21b) 对 11b 进行类似处理,得到相应的 3'-O-(-D-吡喃葡萄糖基)新蝶呤58% 产率的衍生物 (23a)。新蝶呤葡糖苷酸 (5) 和硫磷蝶呤 (6) 的首次合成是通过分别连续去除 18 和 23a 的保护基来实现的。引言 蝶啶环的 C-6 侧链上连接有各种糖的蝶啶苷被发现是由某些原核生物如蓝细菌和厌氧光合细菌产生的。1