Absolute Conformation and Chiroptical Properties. VI. 2,2′,3,3′-Tetramethoxy-9,9′-bitriptycyl: A Stereochemical Analog of 1,2-Disubstituted Ethane with Identical Substituents
作者:Shinji Toyota、Akihiro Yasutomi、Hiroharu Kojima、Yuko Igarashi、Mitsuhiro Asakura、Michinori Oki
DOI:10.1246/bcsj.71.2715
日期:1998.11
3′-tetramethoxy-9,9′-bitriptycyl. The absolute conformation of the tetramethoxy compound was determined by X-ray structure analysis of 3′-ester of (1S,5R,7R)-4-(2-carboxybenzoyl)-3-thia-4-azatricyclo[5.2.1.01,5]decane 3,3-dioxide derived from 3-hydroxy-2,2′,3′-trimethoxy-9,9′-bitriptycyl, followed by hydrolysis and then methylation. The CD spectrum of Msc-2,2′,3,3′-tetramethoxy-9,9′-bitriptycyl is reported
标题化合物通过将 4,5-二甲氧基苄加成至 9,9'-联芳基而制备。旋转异构体ap 和±sc 通过HPLC 分离。±sc 异构体用乙硫醇钠处理产生 3,3'-二羟基-2,2'-二甲氧基-9,9'-二三苯甲基,将其转化为 (1S,5R,7R)-4-[ (2-羧基)苯甲酰基]-3-thia-4-氮杂三环[5.2.1.01,5]癸烷3,3-二氧化物。所得非对映异构体通过HPLC分离。将异构体水解并用硫酸二甲酯甲基化,得到具有旋光活性的 2,2',3,3'-四甲氧基-9,9'-二三苯甲基。四甲氧基化合物的绝对构象通过(1S,5R,7R)-4-(2-羧基苯甲酰基)-3-thia-4-氮杂三环[5.2.1.01,5 ]癸烷 3,3-二氧化物衍生自 3-羟基-2,2',3'-三甲氧基-9,9'-二三萜,然后水解,然后甲基化。报道了 Msc-2,2',3,3'-四甲氧基-9,9'-二三苯甲基的 CD 谱。