作者:Florent Allais、Paul-Henri Ducrot、Mahoulo Aouhansou、Amel Majira
DOI:10.1055/s-0029-1218836
日期:2010.8
A total asymmetric synthesis of rugulactone, a naturally occuring α-pyrone isolated from Cryptocarya rugulosa, is reported. The synthesis involved a cross-metathesis coupling reaction to construct the internal E-olefin group, a Still-Gennari olefination to construct the Z-configured α,β-unsaturated ester group, and a one-pot deprotection and intramolecular lactonization reaction. The stereochemistry at C5 was controlled by the use of a chiral pool.
据报道,一种从隐翅虫(Cryptocarya rugulosa)中分离出来的天然δ-吡喃酮--榄香烯内酯(rugulactone)实现了完全不对称合成。该合成涉及一个交叉甲基化偶联反应以构建内部的 E-烯烃基团,一个 Still-Gennari 烯化反应以构建 Z-构型的 δ、δ²-不饱和酯基团,以及一个一锅脱保护和分子内内酯化反应。通过使用手性池控制了 C5 的立体化学。