Intramolecular Nitrofuran Diels–Alder Reactions: Extremely Substituent-Tolerant Cycloadditions via Asynchronous Transition States
作者:Thomas Y. Cowie、Marcos Veguillas、Robert L. Rae、Mathilde Rougé、Justyna M. Żurek、Andrew W. Prentice、Martin J. Paterson、Magnus W. P. Bebbington
DOI:10.1021/acs.joc.7b00781
日期:2017.7.7
Nitrofurans undergo intramolecularDiels–Alderreactions with tethered electron-poor dienophiles more rapidly and in higher yield than non-nitrated furans. Computational studies indicate that increased stabilization of a partial positive charge on the nitro-substituted carbon in both transition state and product is the driving force for these reactions. Frontier molecular orbital energy differences
zol-5- yl)biphenyl-4-yl]methyl]-1H-imidazole-5-carboxylic acid (1), which was superior to EXP3174 in vitro. Since 1 showed only poor activity against angiotensin II-induced pressor response in rats after oral administration, the carboxylic acid function of 1 was converted into prodrug esters (13). Among these, the 1-[(ethoxycarbonyl)oxy]ethyl ester (13a) showed the most potent and longest-lasting activity
Diels–Alder Reactions of 1-Alkoxy-1-amino-1,3-butadienes: Direct Synthesis of 6-Substituted and 6,6-Disubstituted 2-Cyclohexenones and 6-Substituted 5,6-Dihydropyran-2-ones
作者:Pavel K. Elkin、Nathaniel D. Durfee、Viresh H. Rawal
DOI:10.1021/acs.orglett.1c01031
日期:2021.7.16
dienophiles to afford cycloadducts in good yields with excellent regioselectivities. The hydrolysis of the DA cycloadducts provides 6-substituted and 6,6-disubstituted 2-cylohexenones, which are versatile building blocks for complex molecule synthesis. The corresponding HDA cycloadducts afford 6-substituted 5,6-dihydropyran-2-ones.
The one-pot synthesis of amidonapthoquinones from aminonaphthoquinones
作者:Jinya Yin、Jon D. Rainier
DOI:10.1016/j.tetlet.2020.151800
日期:2020.4
Described here is a one-pot method of synthesizing amidonaphthoquinones from the corresponding aminonaphthoquinones. The scope of amides that can be synthesized using this methodology is relatively broad and the yield of product is higher than the traditional methods of synthesizing these substrates. 2009 Elsevier Ltd. All rights reserved
4-Amino-6,7-dimethoxy-2-piperazinylquinazoline derivatives, their
申请人:Sankyo Company Limited
公开号:US04426382A1
公开(公告)日:1984-01-17
Novel piperazinylquinazoline and homopiperazinylquinazoline compounds which have useful antihypertensive activity and their use including pharmaceutical compositions containing said derivatives as the active antihypertensive component thereof. Said compounds have the following formula. ##STR1## wherein m is 2 or 3 and R is as defined in the specification.