Preparation, structural characterization, and acid-catalyzed isomerization of 3-, 7-, and 9-benzyl-6-benzylthiopurines
作者:Jim J. Huang、Aris Ragouzeos、Janet L. Rideout
DOI:10.1002/jhet.5570310669
日期:1994.11
Benzylation of 6-benzylthiopurine was examined. Structural assignments of the products were determined by 1-D and 2-D nmr spectroscopy (HMQC, HMBC, and nOe). In the presence of base, the isomeric N3-, N7-, and N9-benzylated products 4, 3, and 2 were isolated; however, only 9-benzyl-6-benzylthio-purine (2) was obtained in the absence of base. In the latter case, the initially formed N3- and N7-isomers
检查了6-苄基硫嘌呤的苯甲酰化。产品的结构分配通过一维和二维核磁共振光谱法(HMQC,HMBC和nOe)确定。在碱的存在下,同分异构的N3-,N7-,和N9苄基化产物4,3,和2分离; 然而,在不存在碱的情况下,仅获得9-苄基-6-苄硫基嘌呤(2)。在后一种情况下,最初形成的N3-和N7异构体在酸存在下通过6-苄基硫嘌呤中间体转化为9-苄基-6-苄硫嘌呤(2),这是通过使用反相高压液相色谱。