Chiral non-racemic 4- and 5-oxazolidonecarbaldehydes, typified by 2 and 7, react highly diastereoselectively with organocerium reagents to give moderate to good yields of syn- and anti-alcohols, respectively. Rationalizations for the observed diastereoselectivities are presented. The synthetic potential of this method is exemplified by the synthesis of C-18-D-ribo-phytosphingosine which was obtained
以2和7为代表的手性非外消旋4-和5-
恶唑烷
酮甲醛与有机
铈试剂高度非对映选择性反应,分别产生中等至良好的合成和抗醇收率。提出了观察到的非对映选择性的合理化。该方法的合成潜力通过以其
四乙酸酯形式获得的C-18-
D-核糖-
植物鞘氨醇的合成来举例说明。