cis-configuration formation, and opportunely blocking a potential E/Z isomerization. The practical applicability was highlighted by the synthesis of (Z)-2-(2-tert-butoxycarbonylaminothiazol-4-yl)pent-2-enoic acid, a commercially important side-chain material of cefcapene pivoxil, in a two-step procedure.
从 (E/Z)-2-(2-
溴乙酰基)pent-2 乙基 (E/Z)-2-(2-
溴乙酰基)pent-2 制备一系列 (Z)-2-(2-取代-
噻唑-4-基)pent-2-enoates 的立体选择性或排他性方法-烯酸酯和
硫脲或
硫代酰胺的产率很高。这种方法涉及季碳立体控制的顺式构型形成,并适时地阻止潜在的 E/Z 异构化。(Z)-2-(2-tert-butoxycarbonylaminothiazol-4-yl)pent-2-enoic acid,一种商业上重要的cefcapene pivoxil侧链材料,通过两步法合成,突出了实际适用性.