Asymmetric Synthesis of Synargentolide A and Its 3-Epimer Using the RAMP-Hydrazone Methodology
摘要:
Synargentolide A was synthesized in 11 steps starting from the commercially available 2,2-dimethyl-1,3-dioxan-5-one, employing the SAMP/RAMP-methodology via an alpha,alpha'-bis-alkylation to generate the first two stereogenic centers with virtually complete asymmetric induction (de, ee > 99%). After the asymmetric synthesis of the triol fragment of the molecule, the delta-lactone moiety was constructed using an asymmetric allylation, esterification, and ring-closing metathesis sequence.
First Total Synthesis of Lippialactone and Its C9 Epimer
作者:Palakodety Radha Krishna、Rajesh Nomula、Ramesh Kunde
DOI:10.1055/s-0033-1340314
日期:——
Abstract This paper describes the firsttotalsynthesis of bioactive lippialactone and C9-epi-lippialactone adopting Keck asymmetric allylation/Barbier allylation and olefin cross-metathesis as the key steps. This paper describes the firsttotalsynthesis of bioactive lippialactone and C9-epi-lippialactone adopting Keck asymmetric allylation/Barbier allylation and olefin cross-metathesis as the key