On Water: Silver-Catalyzed Domino Approach for the Synthesis of Benzoxazine/Oxazine-Fused Isoquinolines and Naphthyridines fromo-Alkynyl Aldehydes
摘要:
An operationally simple domino approach for the silver-catalyzed synthesis of oxazine/benzoxazine-fused isoquinolines 5a-q and naphthyridines 6a-v by the reaction of o-alkynyl aldehydes 3a-aa with amines having embedded nucleophiles 4a-d under mild reaction condition in water is described. The reaction shows selective C-N bond formation on the more electrophilic alkynyl carbon resulting in the formation of 6-endo-dig cyclized product. The competitive experiments show the viability of an intramolecular nucleo philic attack over an intermolecular attack of the external nucleophile. This methodology accommodates wide functional group variation, which proves to be useful for structural and biological assessment.
Gold-Catalyzed Synthesis of Dibenzopentalenes - Evidence for Gold Vinylidenes
作者:A. Stephen K. Hashmi、Marcel Wieteck、Ingo Braun、Pascal Nösel、Linda Jongbloed、Matthias Rudolph、Frank Rominger
DOI:10.1002/adsc.201200086
日期:2012.3
converted to dibenzopentalenes in good yields by gold(I) catalysts. The participation of gold acetylides could be proven by the direct conversion to the corresponding gem‐diaurated dibenzopentalenes with a gold catalyst. From an experiment with a gold acetylide complex and stoichiometric amounts of the gold “catalyst” the corresponding gem‐diaurated complex of a dibenzopentalene could be obtained and characterized
A gold(<scp>i</scp>)-catalyzed intramolecular tandem cyclization reaction of alkylidenecyclopropane-containing alkynes
作者:Wei Fang、Yin Wei、Min Shi
DOI:10.1039/c7cc07042j
日期:——
moderate to good yields. The further transformations as well as application of the product have been presented and a plausible reaction mechanism has been also proposed on the basis of deuteriumlabeling and control experiments.
Enantioselective Synthesis of Isoquinolines: Merging Chiral-Phosphine and Gold Catalysis
作者:Yu-Ning Gao、Feng-Chen Shi、Qin Xu、Min Shi
DOI:10.1002/chem.201601129
日期:2016.5.10
The highly enantioselectivesynthesis of dihydroisoquinoline derivatives from aromatic sulfonated imines tethered with an alkyne moiety, through a one‐pot asymmetric relay catalysis of chiral‐phosphine and gold catalysts, is reported. Enantiomerically enriched dihydroisoquinoline derivatives were afforded in good yields and good‐to‐excellent ee values under mild conditions, based on the asymmetric
Catalytic silicon‐carbon or silicon‐heteroatom bond‐forming hydrosilylation has become increasingly important in synthetic chemistry, catalysis and organosilicon chemistry. Herein we report a platinum‐catalyzed one‐pot and tandem hydrosilylation/cyclization of OH‐containing alkynes with dihydrosilanes, allowing for facile synthesis of six‐membered organosiliconcompounds, including silyloxycycles and
A concise synthesis of 10-benzoyl-3,4-dihydroanthracen-1(2<i>H</i>)-one derivatives catalyzed by TfOH under metal-free conditions
作者:Hao Wu、Hua-Dong Chen、Jian-Quan Liu、Qiu-Yan Li、Xiang-Shan Wang
DOI:10.1080/00397911.2021.1912355
日期:2021.6.18
Abstract TfOH was proved to be an efficient catalyst to promote the intra-molecular cyclization, Diels-Alder reaction, deprotonation and dehydration, and provided a concise synthesis of 10-benzoyl-3,4-dihydroanthracen-1(2H)-ones in good yields from a reaction of 2-(phenylethynyl) benzaldehyde and cyclohexane-1,3-dione. It underwent in high regioselectivity when center asymmetrical 4,4-dimethylcyclohexane-1