Stereoselective synthesis of 1,2-diamino-1,2-diarylethane derivatives
作者:I. V. Bessonov、N. A. Lozinskaya、V. R. Katashova、M. V. Proskurnina、N. S. Zefirov
DOI:10.1007/s11172-005-0238-z
日期:2005.1
A procedure was developed for selective opening of the cis-2,4,5-triarylimidazoline ring to form erythro-1,2-diamino-1,2-diarylethane derivatives. These ring-opening products, erythro-ethylenediamine derivatives, can undergo quantitative isomerization to threo-ethylenediamine derivatives in the presence of strong bases in DMSO.
The Dehydrogenation of Nickel(II) Chelates of<i>rac</i>- and<i>meso</i>- 2,2′-[(1,2-Diphenylethylene)bis(iminomethylene)]diphenol and Related Compounds
作者:Hajime Kanatomi
DOI:10.1246/bcsj.56.99
日期:1983.1
the meso-isomzr, [2,2′-(cis-1,2-diphenylethenylene)bis(nitrilomethylidyne)diphenolato]nickel(II)([Ni(SalStil)]) was isolated in addition to the diimine complex ([Ni(meso-SalPhen)]). In this case, the (Remark: Graphics omitted.) bridge was dehydrogenated to (Remark: Graphics omitted.) conjugated double bonds; that is, a fully conjugated metal chelate was formed by the dehydrogenation of the coordinated
乙酸镍 (II) 四水合物和外消旋-和内消旋-2,2'-[(1,2-二苯基亚乙基)双(亚氨基亚甲基)]二苯酚(外消旋和内消旋-BzPhen-H2)在甲醇中形成浅绿色复合物。在有氧条件下长时间加热后,这些配合物的吡啶溶液会沉积深红色的二亚胺配合物。初始配合物的饱和配体系统被分子氧脱氢为不饱和配体。从内消旋异构体的吡啶溶液中,除了二亚胺外,还分离出 [2,2'-(cis-1,2-diphenylenylene)bis(nitrilomethylidyne)diphenolato] 镍 (II)([Ni(SalStil)])复合物 ([Ni(meso-SalPhen)])。在这种情况下,(备注:图示省略。)桥被脱氢成(备注:图示省略。)共轭双键;也就是说,完全共轭的金属螯合物是通过配位配体的脱氢形成的。
Microwave Enabled Umpulong Mechanism Based Rapid and Efficient Four- and Six-Component Domino Formations of 2-(2′-Azaaryl)imidazoles and <i>anti</i>-1,2-Diarylethylbenzamides
作者:Bo Jiang、Xiang Wang、Feng Shi、Shu-Jiang Tu、Teng Ai、Austin Ballew、Guigen Li
DOI:10.1021/jo902204s
日期:2009.12.18
Concise and efficient six-component and four-component domino approaches to anti-1,2-diarylethylbenzamides and highly Substituted 2-(2'-azaaryl)imidazoles have been developed under solvent-free and microwave-irradiation conditions. The reactions showed a broad scope of substrates in which a wide range of common commercial aromatic aldehydes and heteroaryl nitriles can be used. The syntheses were Finished within short periods (15-34 min) with good to excellent chemical yields and stereoselectivity that avoided tedious workup isolations. New mechanisms involving an umpolung have been proposed for these two reaction processes.
Trippett, Journal of the Chemical Society, 1957, p. 4007
作者:Trippett
DOI:——
日期:——
Trippett, Journal of the Chemical Society, 1957, p. 4407