Total Synthesis Provides Strong Evidence: Xestocyclamine A is the Enantiomer of Ingenamine
作者:Zhanchao Meng、Alois Fürstner
DOI:10.1021/jacs.0c05347
日期:2020.7.8
of polycyclic alkaloids. The first totalsynthesis now proves that the structure of this compound had originally been misassigned. The route to (−)-1 is based on a double Michael addition for the formation of the bridged diazadecalin core and a palladium-catalyzed decarboxylative allylation to install the quaternary bridgehead center. Ring-closingalkynemetathesis allowed a 13-membered cycloalkyne
nickel-catalyzed alkylative cyclizationreactions of iodoalkynes with 4-alkyl-1,4-dihydropyridines as alkylation reagents under visible light irradiation have been achieved to afford the corresponding alkylated cyclopentylidenes in good to high yields. Introduction of substituents at the propargylic position of iodoalkynes has led to the stereoselective formation of E-isomers. The present reaction system provides
A Unified Approach to Polycyclic Alkaloids of the Ingenamine Estate: Total Syntheses of Keramaphidin B, Ingenamine, and Nominal Njaoamine I
作者:Zhanchao Meng、Simon M. Spohr、Sandra Tobegen、Christophe Farès、Alois Fürstner
DOI:10.1021/jacs.1c07955
日期:2021.9.8
Many polycyclic marine alkaloids are thought to derive from partly reduced macrocyclic alkylpyridine derivatives via a transannular Diels–Alder reaction that forms their common etheno-bridged diaza-decaline core (“Baldwin–Whitehead hypothesis”). Rather than trying to emulate this biosynthesis pathway, a route to these natural products following purely chemical logic was pursued. Specifically, a Michael/Michael
An <i>N</i>-Acyliminium Cyclization Approach to a Total Synthesis of (+)-Cylindricine C
作者:Jia Liu、Jacob J. Swidorski、Scott D. Peters、Richard P. Hsung
DOI:10.1021/jo0501846
日期:2005.5.1
the development of an enantioselective total synthesis of (+)-cylindricine C are described here. The total synthesis itself was accomplished in 8 steps, featuring an N-acyliminiumcyclization strategy, the seldom-used Wharton rearrangement, and a key epimerization at C5.
An intramolecular interaction between a zinc atom and a carboncarbon triple bond in dihexyn-4-ylzinc
作者:E. Oknińska、K.B. Starowieyski
DOI:10.1016/0022-328x(88)80262-6
日期:1988.6
The new dialkynylmercury and dialkynylzinc compounds [CH3CC(CH2)n]2M (M = Hg, Zn and n = 3, 4) have been synthesized. The presence of a ground-state intramolecular interaction between the zinc atom and a carboncarbon triple bond in dihexyn-4-ylzinc was confirmed from 13C NMR, 1H NMR, and Raman spectra.
新dialkynylmercury和dialkynylzinc化合物[CH 3 CC(CH 2)Ñ ] 2 M(M =汞柱,Zn和Ñ = 3,4)已被合成。由13 C NMR,1 H NMR和拉曼光谱证实了二己基-4-基锌中锌原子与碳碳三键之间存在基态分子内相互作用。