δ-Keto Aminoacrylonitriles and δ-Keto Aminoenones from 1-Pyrrolines, Cyanoacetylenes, and Acetylenic Ketones
作者:Boris A. Trofimov、Ludmila A. Oparina、Anastasiya G. Mal’kina、Nikita A. Kolyvanov、Igor A. Ushakov、Ivan V. Saliy、Konstantin A. Apartsin
DOI:10.1055/a-1742-2736
日期:2022.6
The ring-opening/functionalization of 1-pyrrolines by cyanoacetylenes or acetylenicketones (20–80 °C, MeCN, H2O) affords δ-keto aminoacrylonitriles and δ-keto aminoenones, mostly as the Z-isomers, in up to 85% yields. The synthesis involves C(2)–N bond cleavage in the intermediate hemiaminal resulting from the intermediate 1,3(4)-dipolar 1-pyrroline/acetylene complexes and water.
Catalyst-Free Annulation of Acylethynylpyrroles with 1-Pyrrolines: A Straightforward Access to Tetrahydrodipyrrolo[1,2-<i>a</i>:1′,2′-<i>c</i>]imidazoles
作者:Ludmila A. Oparina、Kseniya V. Belyaeva、Nikita A. Kolyvanov、Igor A. Ushakov、Maxim D. Gotsko、Lyubov’ N. Sobenina、Alexander V. Vashchenko、Boris A. Trofimov
DOI:10.1021/acs.joc.2c00476
日期:2022.8.5
Acylethynylpyrroles undergo facile (rt, MeCN or MeOH, 24–72 h) catalyst-free annulation with 1-pyrrolines to afford acylmethylenetetrahydrodipyrrolo[1,2-a:1′,2′-c]imidazoles in up to 93% yield and 90% E-stereoselectivity of the olefin moiety.
酰基乙炔基吡咯与 1-吡咯啉进行无催化剂环化(室温、MeCN 或 MeOH,24-72 小时),得到酰基亚甲基四氢二吡咯并[1,2- a :1',2' - c ]咪唑,收率高达 93%,产率为 90 % E-烯烃部分的立体选择性。
BEER-LIKE ALCOHOLIC BEVERAGE
申请人:Asahi Group Holdings, Ltd.
公开号:EP3543327A1
公开(公告)日:2019-09-25
The problem of the invention is to provide a beer-like alcoholic beverage with a reduced amount of digestible-carbohydrates, a reduced sensation of alcohol stimulation, and an excellent balance of beer-like flavors. The means for solving the problem is a beer-like alcoholic beverage wherein the amount of 4-vinyl guaiacol (4VG) is 10-200 ppb (w/v) in concentration, the amount of 2-acetyl-1-pyrroline (2AP) is less than 1 ppb (w/v) in concentration, the amount of digestible-carbohydrates is 2.0 g/100 mL or less in concentration, and the amount of alcohol is 4-10% (v/v) in concentration.