Synthesis of a Glyoxalase I Inhibitor fromStreptomyces griseosporeus NIIDAet OGASAWARA
作者:Sohail Mirza、Louis-Pierre Molleyres、Andrea Vasella
DOI:10.1002/hlca.19850680425
日期:1985.6.26
KD16-Ul. Esterification of 2 gave 1, identical with the title compound. Alternatively, 1 was obtained in higher yields by esterification of 21, followed by deprotection of the hydroxy groups. This synthesis gave 1 and 2 from methyl α-D-mannopyranoside in an overall yield of 18 and 20 %, respectively, confirming their absolute configuration.
分别以甲基α-D-吡喃葡萄糖苷和甲基α-D-甘露吡喃糖苷直接制备假内酯6和12。所述pseudolactone 6与反应叔丁基lithioacetate,得到保护的,三羟基环己烯酮羧酸7(51%)。空间位阻,L-核糖-构型pseudolactone 12与反应乙基膦酸二乙酯和甲基膦酸二甲酯,得到受保护的trihydroxycyclohexenones 17(49%)和18(62%),分别。羟甲基化的环己烯酮21由18通过先用Me 2 AlSPh然后再用甲醛处理,将产物19氧化并消除。21的脱保护得到2,与KD16-U1相同。2的酯化得到1,与标题化合物相同。备选地,通过21的酯化,然后使羟基脱保护,以较高的产率获得1。该合成从甲基α-D-甘露吡喃糖苷分别得到1和2,总产率分别为18%和20%,证实了它们的绝对构型。