The catalytic dehydrogenation and tandem transformation of aromatic alcohols, including oxidative coupling of alcohols and amines, were achieved successfully using a catalytic amount of organosilicon-supported titania (TiO2@PMHSIPN), which enables the efficient synthesis of aromatic aldehydes, imines, and benzimidazoles in good to excellent yields.
Chiral α-hydroxy-β-lactams are key fragments of many bioactive compounds and antibiotics, and the development of efficient synthetic methods for these compounds is of great value. The highly enantioselective dynamic kinetic resolution (DKR) of α-keto-β-lactams was realized via a novel proton shuttling strategy. A wide range of α-keto-β-lactams were reduced efficiently and enantioselectively by Ni-catalyzed
作者:Rio Carlo Lirag、Karolina Osowska、Ognjen Š. Miljanić
DOI:10.1039/c2ob25736j
日期:——
Judicious choice of precipitation conditions can lead to self-sorting of equilibrating mixtures of aromatic aldehydes and substituted anilines into a handful of imine products. The selectivity of this process is caused by the solubility differences among possible imines in the EtOH–H2O solvent mixtures used in precipitation.
Synthesis and antifungal activity of N-aryl-N-benzylamines and of their homoallyl analogues
作者:Francisco M. Garibotto、Maximiliano A. Sortino、Vladimir V. Kouznetsov、Ricardo D. Enriz、Susana A. Zacchino
DOI:10.3998/ark.5550190.0012.713
日期:——
Ten N-aryl-N-benzylamines were synthesized and evaluated for their antifungalactivity, which was compared with their homoallylamine analogues that possessed an allyl group in the carbon next to the nitrogen atom. Results indicated that the absence of the allyl group caused an enhancement of the antifungalactivity which could be correlated with the flexibility of the alkyl chain between both aromatic
Catalytic asymmetric Mannich reactions of imines with weakly acidic simple amides were developed using a chiral potassium hexamethyldisilazide (KHMDS)–bis(oxazoline) potassium salt (K-Box) catalyst system. The desired reactions proceeded to afford the target compounds in high yields with high diastereo- and enantioselectivities. It was suggested that a K enolate interacted with K-Box to form a chiral
使用手性六甲基二硅肼钾(KHMDS)-双(恶唑啉)钾盐(K-Box)催化剂体系开发了亚胺与弱酸性简单酰胺的催化不对称曼尼希反应。所需的反应继续进行,以高收率和高非对映选择性和对映选择性提供目标化合物。有人提出,K 烯醇盐与 K-Box 相互作用形成手性 K 烯醇盐,可有效地与亚胺反应。在该系统中,K-Box(Box 的钾盐)作为活性钾物质的手性配体。