A Concise Organocatalytic Synthesis of 3-Deoxy-2-ulosonic Acids through<i>Cinchona</i>-Alkaloid-Promoted Aldol Reactions of Pyruvate
作者:Marta A. Molenda、Sebastian Baś、Jacek Mlynarski
DOI:10.1002/ejoc.201600784
日期:2016.9
concise syntheses of diverse six-, seven-, eight-, and nine-carbon ulosonic acid esters are described, by using a biomimetic three-carbon chain elongation of various sugar aldehydes. Consequently, short and practical syntheses of several ulosonic acids, including three important naturally occurring sugars – 3-deoxy-d-erythro-hex-2-ulosonic acid (KDG), 3-deoxy-d-manno-oct-2-ulosonic acid (KDO), and
由纯有机催化剂介导的丙酮酸酯与手性醛的直接交叉羟醛反应被描述为合成磺酸的关键步骤。含有叔胺基团的金鸡纳生物碱有效地促进了位阻丙酮酸酯与各种糖醛的直接羟醛反应。丙酮酸酯可直接作为PEP(磷酸烯醇式丙酮酸)的化学等价物,模仿自然界使用的合成原理。手性醛与手性催化剂的适当组合允许根据需要灵活地制备反构型或顺构型羟醛。因此,通过使用各种糖醛的仿生三碳链延长,描述了多种六碳、七碳、八碳和九碳磺酸酯的简明合成。最后,