(+)-D-ribonolactone, (S)-2-(hydroxymethyl)butanoate, and (2R,4S)-5-hydroxy-2,4-dimethylpenLanoate. Three new nucleophilic reagents, 8–10, for C-C bond formation have been used. The key steps of the synthesis are: a Suzuki coupling between an alkyl borane and a vinyl bromide (4 + 12e 13), a Julia olefinalion (14 + 17 18), and a Yamaguchi macrolactonizalion to form the 28-membered lactone (18 19), This
抗生素myxovirescine中号2从7个积木(合成1 - 7,方案1),其中所采用的下列手性起始材料:(小号) -
苹果酸,(+) - d-
核糖酸内酯,(小号)-2- (羟甲基)
丁酸酯和(2 R,4 S)-5-羟基-
2,4-二甲基戊酸酯。三个新的亲核试剂,8 - 10,用于CC键形成已被使用。合成的关键步骤是:烷基
硼烷与
乙烯基溴(4 + 12e 13)之间的Suzuki偶联,朱莉娅(Julia) 烯醛(14 + 17 18)和山口大内酯化以形成28元内酯(18 19)。这种极其会聚的合成方法将允许制备31种已知的粘液新霉素分子。