Pyridone Annulation via Tandem Curtius Rearrangement/6π-Electrocyclization: Total Synthesis of (−)-Lyconadin C
作者:Xiayun Cheng、Stephen P. Waters
DOI:10.1021/ol401954f
日期:2013.8.16
A concise, enantioselective totalsynthesis of the Lycopodium alkaloid (−)-lyconadin C was achieved in 12 steps and high overall yield. Key features include construction of a luciduline congener through Mannich-type cyclization and a one-pot, tandem Curtius rearrangement/6π-electrocyclization to fashion the 2-pyridone system of lyconadin C.
作者:Renzo A. Samame、Christina M. Owens、Scott D. Rychnovsky
DOI:10.1039/c5sc03262h
日期:——
Biomimetic transannular Mannich cyclization led to (+)-fastigiatine.
仿生跨环Manich环化反应导致了(+)-fastigiatine。
Concise Total Syntheses of the <i>Lycopodium</i> Alkaloids (±)-Nankakurines A and B via Luciduline
作者:Xiayun Cheng、Stephen P. Waters
DOI:10.1021/ol902455y
日期:2010.1.15
Total syntheses of the Lycopodium alkaloids nankakurines A and B have been accomplished in 6 and 7 steps, respectively, via a sequence that passes through a third Lycopodium alkaloid, luciduline, and forgoes the use of protecting groups on nitrogen. Key features include a short preparation of luciduline followed by a concise and stereoselective aminoallylation/ring-closing metathesis protocol to fashion the spiropiperidine ring common to nankakurines A and B.
Enantioselective Total Syntheses of Lyconadins A–E through a Palladium‐Catalyzed Heck‐Type Reaction
作者:Jiayang Zhang、Yangtian Yan、Rong Hu、Ting Li、Wen‐Ju Bai、Yang Yang
DOI:10.1002/anie.201912948
日期:2020.2.10
thiocarbamates has been designed to construct bridged seven-membered-ring systems that are otherwise challenging to prepare. Taking advantage of this newly developed method, enantioselective syntheses of lyconadins A-E (1-5), lycopecurine (6), and dehydrolycopecurine (7) have been realized in a divergent fashion. Our synthetic strategy also features an intramolecular cyclization of a N-chloroamine to forge the
Second-Generation Synthesis of (+)-Fastigiatine Inspired by Conformational Studies
作者:Jacob C. DeForest、Renzo A. Samame、Gregory Suryn、Alexander Burtea、Scott D. Rychnovsky
DOI:10.1021/acs.joc.8b01144
日期:2018.8.17
problematic steps from our initial synthesis. Selective reduction and protection of the C13 ketone improved the yield and reliability of the dibromocarbene ring expansion step. In the prior synthesis, cuprate addition to the C10 enone generated a 1:1 mixture of isomers in an advanced intermediate. Protection of the C13 alcohol with a large silyl group changed the conformational preference of the enone and