Convenient metal-free direct oxidative amidation of aldehyde using dibromoisocyanuric acid under mild conditions
作者:Soosung Kang、Minh Thanh La、Hee-Kwon Kim
DOI:10.1016/j.tetlet.2018.08.026
日期:2018.9
synthesized by an oxidative amidation in the presence of dibromoisocyanuric acid (DBI). Treatment of aromatic and aliphatic aldehydes with dibromoisocyanuric acid generated acyl bromide intermediates, which were employed to react with a variety of secondary and primary amines to give amides. Through this reaction method, various amides were synthesized directly from aldehydes undermildconditions in high yields
The invention provides novel antibiotic cefuroxime esters of the formula ##STR1## (wherein R.sup.1 is a primary or secondary alkyl group containing 1 to 4 carbon atoms and R.sup.2 is a primary or secondary alkyl group containing 1 to 6 carbon atoms provided that at least one of the groups R.sup.1 and R.sup.2 is methyl). These compounds are useful as orally administrable broad spectrum antibiotics.
Catalytic Asymmetric Acyl Halide−Aldehyde Cyclocondensation Reactions of Substituted Ketenes
作者:Scott G. Nelson、Cheng Zhu、Xiaoqiang Shen
DOI:10.1021/ja0391208
日期:2004.1.1
Catalyticasymmetricacylhalide-aldehydecyclocondensation (AAC) reactions of alkyl-substituted ketenes with structurally diverse aldehydes provide cis-disubstituted beta-lactones with high enantioselectivity. The AAC reactions utilize a novel Al(III)-triamine catalyst in which the metal's dynamic coordination geometry leads to a highly selective catalyst complex. These AAC reactions represent a functional
Furo(3,2-b)indole derivatives. V Synthesis and structure-activity studies of 4-substituted 2-(4-methylpiperazinylcarbonyl)-6-trifluoromethylfuro(3,2-b)indole derivatives with analgesic and antiinflammatory activities.
Based on the quantitative structure-activity relationships (QSAR) of 4, 6-disubstituted 2-morpholinocarbonylfuro [3, 2-b] indole derivatives (53 compounds) previously reported, 4-substituted 2- (4-methylpiperazinylcarbonyl) -6-trifluoromethylfuro [3, 2-b] indole derivatives (12 compounds) were synthesized. Their analgesic and antiinflammatory activities were examined by using the acetic acid writhing test in mice and the carrageenin edema test in rats, respectively. Most of these compounds showed potent analgesic and antiinflammatory activities as compared with tiaramide. The QSAR of the furo [3, 2-b] indole derivatives (65 compounds) including the newly synthesized compounds was analyzed by using the adaptive least-squares method. The results confirmed that the QSARs for 2-morpholinocarbonyl derivatives and 2- (4-methylpiperazinylcarbonyl) derivatives can be expressed in one model where the steric nature of the 4-and 6-substituents mainly affects both the analgesic and antiinflammatory potencies.