Stereoselective Synthesis of (+)-SCH 351448: A Unique Ligand System for Sodium, Calcium, and Other Cations
作者:Eun Joo Kang、Eun Jin Cho、Mi Kyung Ji、Young Eun Lee、Dong Mok Shin、Soo Young Choi、Young Keun Chung、Jong-Seo Kim、Hie-Joon Kim、Sueg-Geun Lee、Myoung Soo Lah、Eun Lee
DOI:10.1021/jo0507993
日期:2005.8.1
(+)-SCH 351448 (Na+ salt A) was synthesized employing ring-closing olefin metathesis reaction of an open diene diester intermediate for construction of the 28-membered macrodiolide structure. The open diene diester was prepared from the monomeric hydroxy carboxylic acid and two different olefin fragments. The monomeric hydroxy acid was synthesized via Julia-Julia coupling reaction of intermediates derived from the same olefinic fragments. Oxane units in these fragments were prepared by radical cyclization reactions of beta-alkoxyacrylates. Analogous SCH 351448 salts incorporating other mono- and divalent cations may be prepared. Under acidic conditions, SCH 351448 (Na+ salt A) was the most stable complex, but SCH 351448 (Ca2+ salt) and (Na+ salt B) appear to be physiologically important species.
(+)−SCH 351448(钠盐A)是通过环闭烯烃复分解反应,利用一种开放性二烯二酯中间体构建28元大环二酯结构而合成的。该开放性二烯二酯是通过单体羟基羧酸和两种不同的烯烃片段制备的。单体羟基酸是通过Julia–Julia偶联反应,由同一烯烃片段衍生的中间体合成的。这些片段中的环氧丙烷单元是通过β−烷氧基丙烯酸酯的自由基环化反应制备的。类似地,SCH 351448盐中还可以引入其他单价和二价阳离子。在酸性条件下,SCH 351448(钠盐A)是最稳定的复合物,但SCH 351448(钙盐)和(钠盐B)似乎是有生理意义的物种。