A New and Efficient Approach to Prepare N-Acetyl GM(3) Ganglioside via Trisaccharide [1 -> 4] Lactone

作者：Regalado Calderin Abel; Mesa Hernandez Miriam; Chavez Pineiro Diamela; Gonzalez Serpa Ricelia; Monteserin Castanedo Lazaro Andres; Rodriguez Montero Maria del Carmen; Tolon Murgia Blanca; Veloso Pita Roberto Carlos; Garrido Arteaga Raine; Fernandez Santana Violeta; Verez Bencomo Vicente; Lopez Lopez Miguel Antonio

来源：Organic Process Research & Development, 2013, 17(1): 53-60.

DOI：10.1021/op300265r

The N-acetyl GM(3) ganglioside (NAcGM(3)) is an important glycosphingolipid currently used to prepare a new therapeutic cancer vaccine. Some quantities of this ganglioside were obtained by using [1 -> 4] lactone as the trisaccharide protective function. Thus, sialylation of hexabenzyllactose acceptor with 5-acetyl neuraminylthiophenyl donor afforded the (2 -> 3) trisaccharide as an alpha/beta (3:1) mixture. The alpha-anomer was isolated through selective [1 -> 4] lactone formation followed by chromatography. The lactone was hydrogenolyzed, per-O-acetylated, and selectively deacetylated, and a trichloroacetimidate donor was synthesized from the obtained compound. Azidosphingosine glycosylation, followed by azide group reduction and acylation of the resulting amino glycoside with stearic acid provided the protected ganglioside, which was finally subjected to the Zemplen's procedure, before saponification, to obtain the NAcGM(3) in an overall yield of 11.5% at multigram scale.

• 出版日期2013-1