Repurposing an Aldolase for the Chemoenzymatic Synthesis of Substituted Quinolines
作者:Douglas J. Fansher、Richard Granger、Satinderpal Kaur、David R. J. Palmer
DOI:10.1021/acscatal.1c01398
日期:2021.6.18
Quinoline derivatives are important natural products and pharmaceuticals, but their synthesis can be challenging due to poor yields, harsh reaction conditions, and instability of starting materials. Here we report the chemoenzymatic synthesis of quinaldic acids under mild conditions using an aldolase, trans-o-hydroxybenzylidenepyruvate hydratase-aldolase (NahE, or HBPA). A series of 2-aminobenzaldehydes
喹啉衍生物是重要的天然产物和药物,但由于收率低、反应条件苛刻和起始材料不稳定,它们的合成具有挑战性。在这里,我们报告了使用醛缩酶、反式-o-羟基亚苄基丙酮酸水合酶-醛缩酶(NahE 或 HBPA)在温和条件下化学酶法合成喹哪二酸。在 NahE 存在下,一系列源自相应硝基类似物还原的 2-氨基苯甲醛与丙酮酸反应,以高达 93% 的分离产率得到取代的喹啉。该反应不同于体内NahE 催化的羟醛缩合,而是类似于由其同源物二氢吡啶二羧酸合酶催化的杂环形成。
Benzoazepine-Fused Isoindolines via Intramolecular (3 + 2)-Cycloadditions of Azomethine Ylides with Dinitroarenes
作者:Steven M. Wales、Daniel J. Rivinoja、Michael G. Gardiner、Melissa J. Bird、Adam G. Meyer、John H. Ryan、Christopher J. T. Hyland
DOI:10.1021/acs.orglett.9b01580
日期:2019.6.21
N-substituted α-amino acids to form unprecedented benzoazepine-fused isoindolines. The reaction proceeds via a dearomatization/rearomatization sequence involving an intramolecular (3 + 2)-cycloaddition between the in situ formed azomethine ylide and the dinitroarene. Various glycine derivatives are tolerated as well as branched substrates based on cyclic, α-mono-, and α,α-disubstituted amino acids, giving
Disubstituted bicyclic heterocycles, the preparations and the use
申请人:Boehringer Ingelheim Pharma KG
公开号:US06087380A1
公开(公告)日:2000-07-11
New disubstituted bicyclic heterocycles of general formula R.sub.a --A--Het--B--Ar--E (I) Compounds of the above general formula I, wherein E denotes an R.sub.b NH--C(.dbd.NH)-- group, have valuable pharmacological properties, particularly a thrombin-inhibiting effect and the effect of prolonging thrombin time, and those wherein E denotes a cyano group, are valuable intermediates for preparing the other compounds of general formula I. Exemplary compounds of formula I are: (a) 1-Methyl-2-[N-(4-amidinophenyl)-aminomethyl]-benzimidazol-5-yl-carboxylic acid-N-phenyl-N-(2-hydroxycarbonylethyl)-amide, (b) 1-Methyl-2-[N-(4-amidinophenyl)-aminomethyl]-benzimidazol-5-yl-carboxylic acid-N-(2-pyridyl)-N-(hydroxycarbonylmethyl)-amide, (c) 1-Methyl-2-[N-(4-amidino-2-methoxy-phenyl)-aminomethyl]-benzimidazol-5-yl- carboxylic acid-N-(2-pyridyl)-N-(hydroxycarbonylmethyl)-amide, and (d) 1-Methyl-2-[N-[4-(N-n-hexyloxycarbonylamidino)phenyl]aminomethyl]-benzimid azol-5-yl-carboxylic acid-N-(2-pyridyl)-N-(2-ethoxycarbonylethyl) amide.
A highly effective one-pot synthesis of quinolines from o-nitroarylcarbaldehydes
作者:An-Hu Li、Eilaf Ahmed、Xin Chen、Matthew Cox、Andrew P. Crew、Han-Qing Dong、Meizhong Jin、Lifu Ma、Bijoy Panicker、Kam W. Siu、Arno G. Steinig、Kathryn M. Stolz、Paula A. R. Tavares、Brian Volk、Qinghua Weng、Doug Werner、Mark J. Mulvihill
DOI:10.1039/b613775j
日期:——
A highly effective one-pot Friedländer quinoline synthesis using inexpensive reagents has been developed. o-Nitroarylcarbaldehydes were reduced to o-aminoarylcarbaldehydes with iron in the presence of catalytic HCl (aq.) and subsequently condensed in situ with aldehydes or ketones to form mono- or di-substituted quinolines in high yields (66–100%).
effective one-pot Friedländer quinolinesynthesisfrom o-nitroarylcarbaldehydes and ketones or aldehydes was developed and the scope and limitations of the method were examined. The o-nitroarylcarbaldehydes were reduced to o-aminoarylcarbaldehydes with iron in the presence of a catalytic amount of aqueous hydrochloric acid; the amino compounds were then condensed in situ with ketones or aldehydes to form