Eight-Step Enantioselective Total Synthesis of (−)-Cycloclavine
作者:Stephanie R. McCabe、Peter Wipf
DOI:10.1002/anie.201608820
日期:2017.1.2
The first enantioselectivetotalsynthesis of (−)‐cycloclavine was accomplished in 8 steps and 7.1 % overall yield. Key features include the first catalytic asymmetric cyclopropanation of allene, mediated by the dirhodium catalyst Rh2(S‐TBPTTL)4, and the enone 1,2‐addition of a new TEMPO carbamate methyl carbanion. An intramolecular strain‐promoted Diels–Alder methylenecyclopropane (IMDAMC) reaction
We report the first intramolecularenantioselectivecyclopropanation of indoles, which was accomplished in good to high yield (up to 94%) with excellent enantioselectivity (up to >99.9% ee) by using copper or iron complexes of chiral spiro bisoxazolines as catalysts. This reaction is a straightforward, efficient method for constructing polycyclic compounds with an all-carbon quaternary stereogenic
Highly Stereoselective [2,3]-Sigmatropic Rearrangement of Sulfur Ylide Generated through Cu(I) Carbene and Sulfides
作者:Ming Ma、Lingling Peng、Changkun Li、Xiu Zhang、Jianbo Wang
DOI:10.1021/ja055021d
日期:2005.11.1
A highly stereoselective [2,3]-sigmatropic rearrangement of sulfur ylide generated through Cu(I) carbene and allyl and propargyl sulfides by a double asymmetric induction approach that combines a chiral camphor sultam auxiliary and Cu(I) catalyst with chiral or achiral diimine ligands has been developed.
Aryl versus Alkyl Redox-Active Diazoacetates ─ Light-Induced C–H Insertion or 1,2-Rearrangement
作者:João V. Santiago、Katarzyna Orłowska、Michał Ociepa、Dorota Gryko
DOI:10.1021/acs.orglett.3c02055
日期:2023.9.1
Diazo compounds with redox-active leavinggroups are versatile reagents for orthogonal functionalizations, previously utilized in the Rh-catalyzed synthesis of highly substituted cyclopropanes. Photochemical activation of aryl-substituted diazoacetates generates carbenes, whereas redox-active esters can furnish C-radicals via the photoexcitation of EDA complexes. However, the photochemical behavior
Asymmetric Total Synthesis and Biological Evaluation of (+)-Cycloclavine
作者:Stephanie McCabe、Peter Wipf
DOI:10.1055/s-0037-1610395
日期:2019.1
Published as part of the 50 Years SYNTHESIS – Golden Anniversary Issue Abstract The first totalsynthesis of natural (+)-cycloclavine uses a catalytic asymmetric cyclopropanation of allene, a regiospecific Pd-catalyzed enone formation, and two intramolecular Diels–Alder reactions for indole/indoline annulations. The binding properties of natural (+)- and unnatural (–)-cycloclavine on 16 CNS receptors