Metal-Free One-Pot Oxidative Amination of Aldehydes to Amides
作者:Kekeli Ekoue-Kovi、Christian Wolf
DOI:10.1021/ol7014626
日期:2007.8.1
Metal-free oxidativeamination of aromatic aldehydes in the presence of TBHP provides convenient access to amides in 85-99% under mild reaction conditions within 5 h. This method avoids free carboxylic acid intermediates and integrates aldehyde oxidation and amide bond formation, which are usually accomplished separately, into a single operation. Proline-derived amides can be prepared in excellent
A simple, mild, catalyst-free, and efficacious KOtBu-mediated reductive cyanation reaction of tertiary amides under hydrosilylation conditions has been described. A series of α-aminonitriles is obtained in moderate to high yield with good functional group tolerance. The reaction works well with a readily available amide substrate, a cheap and versatile base KOtBu, and a commercially available hydrosilane
已经描述了一种简单、温和、无催化剂和有效的 KO t Bu 介导的叔酰胺在氢化硅烷化条件下的还原氰化反应。以中等至高产率获得了一系列具有良好官能团耐受性的α-氨基腈。该反应适用于现成的酰胺底物、廉价且用途广泛的碱 KO t Bu 和市售的氢硅烷 (EtO) 3 SiH,便于后处理和纯化。
A Convergent Synthesis of Functionalized Alkenyl Halides through Cobalt(III)‐Catalyzed Three‐Component C−H Bond Addition
作者:Jeffrey A. Boerth、Jonathan A. Ellman
DOI:10.1002/anie.201705817
日期:2017.8.7
A CoIII-catalyzed three-component coupling of C(sp2)−H bonds, alkynes, and halogenating agents to give alkenyl halides is reported. This transformation proceeds with high regio- and diastereoselectivity, and is effective for a broad range of aryl and alkyl terminal alkynes. Diverse C−H bond partners also exhibit good reactivity for a range of heteroaryl and aryl systems as well as synthetically useful
acylation of symmetrical carboxylic anhydrides has inherited limitation of reaction efficiency along with relatively poor reactivity. Traditionally, one equivalent carboxylic acid is generated during nucleophilic acylation of a symmetrical anhydride, which always limits the yield of final product to 50% or less. This is a major drawback, which discourages the use of anhydrides for laboratory or industrial