Au(I)-Catalyzed Ring Expanding Cycloisomerizations: Total Synthesis of Ventricosene
作者:Steven G. Sethofer、Steven T. Staben、Olivia Y. Hung、F. Dean Toste
DOI:10.1021/ol801760w
日期:2008.10.2
The gold(I)-catalyzed cycloisomerization of enynes containing an embedded cyclopropane unit leads selectively to the formation of ring systems containing the cyclopropylmethyl cation. A subsequent Wagner-Merwein shift provides diastereomerically pure fused cyclobutanes. The utility of this methodology for the rapid assembly of polycyclic ring systems is illustrated by the total synthesis of the angular
Enantioselective Total Synthesis of Chondrosterins I and J by Catalytic Asymmetric Intramolecular Aldol Reaction Using Chiral Diamine Catalyst
作者:Yuichiro Kawamoto、Daiki Ozone、Toyoharu Kobayashi、Hisanaka Ito
DOI:10.1002/ejoc.202000579
日期:2020.7.15
The first enantioselective total synthesis of chondrosterins I and J was accomplished featuring a catalytic asymmetric intramolecular aldol reaction with chiral diaminecatalyst. The enantiomeric excess was as high as 92 % ee .
Total synthesis of (±)-chondrosterin I using a desymmetric aldol reaction
作者:Yuichiro Kawamoto、Daiki Ozone、Toyoharu Kobayashi、Hisanaka Ito
DOI:10.1039/c8ob02557f
日期:——
The first totalsynthesis of racemic chondrosterin I was accomplished. The synthetic features include a Michael addition to incorporate a nitro alkane moiety, an oxidative Nef reaction, intramolecular cyclization of the γ-ketoester derivative, and a desymmetric intramolecular aldol reaction of the meso diketoester compound. The present strategy will be applicable to the synthesis of an optically active
Total Synthesis of (−)-Antroalbocin A Enabled by a Strain Release-Controlled Photochemical 1,3-Acyl Shift
作者:Björn Siekmeyer、Dennis Lübken、Kevin Bajerke、Bastian Bernhardt、Peter R. Schreiner、Markus Kalesse
DOI:10.1021/acs.orglett.2c02347
日期:2022.8.12
The first bioinspired, enantioselective, and protecting group free totalsynthesis of the antibacterial sesquiterpenoid (−)-antroalbocin A (1) has been achieved in 12 steps (5.4% overall yield) from dimedone. An organocatalytic Robinson annulation gave rapid access to the tricyclic enone (19) as starting material for the photochemical domino process of deconjugation and sigmatropic 1,3-acyl shift.