New activating agents, 3,3′-(phenylphosphinylidene)bis[2(3H)-benzoxazolone] (4) and 3,3′-(phenylphosphinylidene)bis[2(3H)-benzothiazolone] (5), were readily prepared by the reaction of phenylphosphonic dichloride (3) with 2(3H)-benzoxazolone (1) and 2(3H)-benzothiazolone (2) respectively in the presence of triethylamine at room temperature. The new activating agents 4 and 5 were found to be useful
Sulfur-Fluoride Exchange (SuFEx)-Mediated Synthesis of Sterically Hindered and Electron-Deficient Secondary and Tertiary Amides via Acyl Fluoride Intermediates
作者:Christopher J. Smedley、Andrew S. Barrow、Christian Spiteri、Marie-Claire Giel、Pallavi Sharma、John E. Moses
DOI:10.1002/chem.201701552
日期:2017.7.26
Amide bond formation is one of the most executed reactions in chemistry and biology. This is largely due to the ubiquity of the amide functional group in biological molecules, natural products and pharmaceutically important drugs. We report here the development of “SuFExAmide”: a new sulfur–fluoride exchange (SuFEx) click chemistry based protocol for the efficient amidation of carboxylic acids via
One-Pot Synthesis of Seven-Membered Heterocyclic Derivatives of Diazepines Involving Copper-Catalyzed Rearrangement Cascade Allyl-Amination
作者:Yuepeng Chen、Xinglei Liu、Wei Shi、Shilong Zheng、Guangdi Wang、Ling He
DOI:10.1021/acs.joc.9b02710
日期:2020.4.17
trifluoromethanesulfonate as catalysts in the presence of triphenylphosphine. This synthesis process involves nitrene formation, C–H bond insertion, C═C bond rearrangement, and C–N bond formation cascade reactions via copper- and molybdenum-catalyzed mediation. The method features a wide substrate scope and a moderate to high yield (up to 90%), exhibiting the possibility for practical applications
提出了一种在三苯基膦存在下,以乙酰丙酮钼和三氟甲磺酸铜 (II) 为催化剂,从邻硝基苯甲酸N-烯丙基酰胺合成 1,4-苯二氮卓-5-酮的新型有效方法。该合成过程包括氮烯形成、C-H 键插入、C=C 键重排以及通过铜和钼催化介导的 C-N 键形成级联反应。该方法具有广泛的底物范围和中高产率(高达 90%),具有实际应用的可能性。
Cu-catalyzed reduction of azaarenes and nitroaromatics with diboronic acid as reductant
copper-catalyzed reduction of azaarenes with diboronicacid as reductant in an aprotic solvent under mild conditions has been developed. Most interestingly, the nitroazaarenes could be reduced exclusively to give the corresponding amines without touching the azaarene moieties. Furthermore, the reductive amination of aromatic nitro compounds and aromatic aldehydes has also been realized. A series of