acid/base-free domino process is developed for the regioselective synthesis of 1,2,4-trisubstituted pyrroles. The process involves 1,3-dipolar cycloaddition of unsymmetrical azomethine ylide resulting from the thermal C–C bond cleavage of unactivated aziridines with β-bromo-β-nitrostyrene, followed by a cascade of elimination and aromatization reaction sequence to preferentially furnish 1,2,4-trisubstituted
transmission along the aromatic system, thus enabling dynamickineticresolution via a traditional reversible deprotonation–protonation process. Enantioenriched 9-substituted 9H-fluorene frameworks were finally constructed through an asymmetric vinylogous Michael addition to nitroolefins, followed by a cascade cyclization and oxidative aromatization process, under the catalysis of a chiral bifunctional thiourea-tertiary
ORGANIC METAL COMPOUND, ORGANIC LIGHT-EMITTING DEVICES EMPLOYING THE SAME
申请人:INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
公开号:US20170155063A1
公开(公告)日:2017-06-01
Organic metal compounds, and organic light-emitting devices employing the same are provided. The organic metal compound has a chemical structure represented by formula (I):
wherein each R
1
is independent and can be hydrogen, C
1-12
alkyl group, C
1-12
alkoxy group, amine, C
2-6
alkenyl group, C
2-6
alkynyl group, C
5-10
cycloalkyl group, C
3-12
heteroaryl group, or C
6-12
aryl group; R
2
, R
3
, R
4
, and R
5
are independent and can be hydrogen, halogen, C
1-12
alkyl group, C
1-12
fluoroalkyl group, or two adjacent groups of R
2
, R
3
, R
4
, and R
5
are optionally combined with the carbon atoms which they are attached to, to form a cycloalkyl group, or aryl group; R
6
and R
7
are independent and can be C
1-6
alkyl group, or phenyl group; and, n is 0 or 1.
Sulfated tungstate a heterogeneous acid catalyst for synthesis of 4-aryl-<i>NH</i>-1,2,3-triazoles by 1,3-dipolar cycloaddition of nitroolefins with NaN<sub>3</sub>
作者:Snehalata B. Autade、Krishnacharya G. Akamanchi
DOI:10.1080/00397911.2019.1612919
日期:2019.8.3
Abstract A facile and new method for the synthesis of 4-aryl-NH-1,2,3-triazoles from nitroolefins and NaN3 by 1,3-dipolar cycloaddition reaction, employing a mild solid inorganic acid sulfated tungstate as a heterogeneous catalyst, has been developed. The protocol emphasizes broad substrate scope with many functionalities, less reaction time, stability to open air, easy work-up, and with good to excellent
Diels-alder reactions of 2-(2-nitroethenyl)-1<i>H</i>-pyrroles and their oxygen and sulfur analogs with quinones
作者:Wayland E. Noland、Gianluca Pardi
DOI:10.1002/jhet.5570420617
日期:2005.9
Diels-Alder reaction of 2-(E-2-nitroethenyl)-1H-pyrrole (2a) with 1,4-benzoquinone gave the desired benzo[e]indole-6, 9(3H)-dione (4a) in 10% yield versus a 26% yield (lit. 86% [5]) of the known N-methyl compound (4b) from the N-(or 1)-methyl compound (2b). Protection of the nitrogen of 2a with a phenylsul-fonyl group (2c) gave a 9% yield of the corresponding N-(or 3)-phenylsulfonyl compound (4c).
2-(E -2-硝基乙烯基)-1 H-吡咯(2a)与1,4-苯醌的Diels-Alder反应得到所需的苯并[ e ]吲哚-6,9(3 H)-二酮(4a)。从N-(或1)-甲基化合物(2b)得到的已知N-甲基化合物(4b)的产率为10%,而产率为26%(86%[5] )。用苯基磺酰基(2c)保护2a的氮得到9%的相应的N-(或3)-苯基磺酰基化合物(4c)。2b的反应用1,4-萘醌的苯甲酸酯的产率为6%(浓度为64%[5]),已知的3-甲基萘[2,3 - e ]-吲哚-6,9(3H)-二酮(6)。2-(E -2-硝基乙烯基)呋喃(8a)的反应产生少量所需的萘并[2,1 - b ]呋喃-6,9-二酮(9a),通过比较其NMR谱图可知的4b。2-(E -2-硝基乙烯基)噻吩(8b)的相应反应得到萘并[2,1 - b ]噻吩-6,9-二酮(9b)的产率为4%),先前制备过程以24%的收率[12],