Synthesis and intramolecular hydrogen bonding and biochemical studies of clitocine, a naturally occurring exocyclic amino nucleoside
作者:Randall J. Moss、Charles R. Petrie、Rich B. Meyer、L. Dee Nord、Randall C. Willis、Roberts A. Smith、Steven B. Larson、Ganesh D. Kini、Roland K. Robins
DOI:10.1021/jm00399a017
日期:1988.4
The total synthesis of clitocine [6-amino-5-nitro-4-(beta-D-ribofuranosylamino)pyrimidine] (1), a nucleoside recently isolated from the mushroom Clitocybe inversa, has been accomplished. Glycosylation of 4,6-diamino-5-nitropyrimidine (4) with 1-O-acetyl-2,3,5-tri-O-benzoyl-D-ribofuranose afforded the protected nucleoside 6-amino-5-nitro-4-[(2,3,5-tri-O-benzoyl-beta-D-ribofuranosyl) amino]pyrimidine
已经完成了从最近从蘑菇克霉菌中分离出来的核苷-克利斯汀[6-氨基-5-硝基-4-(β-D-核呋喃糖基氨基)嘧啶]的总合成。用1-O-乙酰基-2,3,5-三-O-苯甲酰基-D-呋喃呋喃糖将4,6-二氨基-5-硝基嘧啶(4)糖基化,得到受保护的核苷6-氨基5-硝基-4- [(2,3,5-三-O-苯甲酰基-β-D-呋喃呋喃糖基)氨基]嘧啶(5)仅作为β-端基异构体具有良好的收率。用NaOMe / MeOH对5脱保护,得到1,分别为β-端基和α-端基异构体的11.5:1混合物。从MeOH中重结晶,然后进行色谱,得到1,其含有少于1%的其α-端基异构体。X-射线晶体数据揭示了在锁精氨酸中的平面糖苷配基部分,其中硝基的每个氧原子分子内氢键合到两个相邻氨基官能团的氢原子上。Clitocine体外抑制ID50为3 X 10(-8)M的L1210细胞。Clitocine还被发现是Ki值为3 X 10(-6)M的腺苷激酶的底物和抑制剂。