作者:Raku Watanabe、Nobuki Kato、Kengo Hayashi、Sho Tozawa、Yusuke Ogura、Shigefumi Kuwahara、Minoru Ueda
DOI:10.1002/open.202000210
日期:2020.10
An efficient and stereoselective syntheses of all the possible stereoisomers of coronafacic acid (CFA) has been developed. The stereochemistries of C3a and C7a were controlled in a diastereoselective Diels‐Alder type cycloaddition using a chiral auxiliary. CFA and 6‐epi‐CFA were synthesized by hydrogenation of a common intermediate. During the synthesis of 6‐epi‐CFA, we established that its cis‐fused
已经开发出一种有效且立体选择性合成所有可能的冠发酸(CFA)立体异构体的方法。C3a 和 C7a 的立体化学通过使用手性助剂的非对映选择性 Diels-Alder 型环加成进行控制。CFA 和 6- epi -CFA 通过共同中间体的氢化合成。在 6- epi -CFA的合成过程中,我们确定其顺式稠合构型对于通过脱水引入 C4-C5 双键非常重要。该报告是 6- epi -CFA 及其对映体的首次实际合成。