We have developed a concise diastereoselective total synthesis of (±)-parvistemonine A. By using a Mukaiyama–Michael addition, an aza-Wittig reaction, a Paal–Knorr pyrrole synthesis, an acid-mediated annulation, and a Mitsunobu reaction as key steps, we achieved a total synthesis in which the longest linear sequence was ten steps and the overall yield was 19.6%. Additionally, the relative stereochemistry
我们开发了一种简洁的 (±)-parvistemonine A 的非对映选择性全合成。 通过使用 Mukaiyama-Michael 加成、aza-Wittig 反应、Paal-Knorr 吡咯合成、酸介导的环化和 Mitsunobu 反应作为关键步骤,我们实现了最长的线性序列为十步的全合成,总产率为19.6%。此外,首次通过 X 射线晶体学分析证实了 parvistemonine A 的相对立体化学。
A stereocontrolled synthesis of trisubstituted cyclohexanes and cyclopentanes. Its application to the synthesis of 11-deoxyprostaglandins.
1, 4-Addition of organocopper reagents to γ-substituted α, β-unsaturated γ-lactones followed by intramolecular trapping of the resulted enolates afforded cis, cis-1, 2, 3-trisubstituted cyclopentanes and cyclohexanes in a stereocontrolled manner. This new cyclization reaction to cyclopentanes provides a new synthetic route to the key intermediate in the synthesis of 11-deoxyprostaglandins.