Regioselective Hydrogenolysis of Donor–Acceptor Cyclopropanes with Zn-AcOH Reductive System
作者:Konstantin L. Ivanov、Elena V. Villemson、Gennadij V. Latyshev、Stanislav I. Bezzubov、Alexander G. Majouga、Mikhail Ya. Melnikov、Ekaterina M. Budynina
DOI:10.1021/acs.joc.7b01549
日期:2017.9.15
convenient low-cost method for regioselective ring-opening of donor–acceptor cyclopropanes with the Zn-AcOH reductive system was developed. The general character of the method was displayed via efficient reduction of a representative series of 2-(het)arylcyclopropane-1,1-diesters as well as donor–acceptor cyclopropanes with other types of electron-withdrawing activating groups. This method opens a rapid
Reductive Arylation of Arylidene Malonates Using Photoredox Catalysis
作者:Rick C. Betori、Karl A. Scheidt
DOI:10.1021/acscatal.9b03608
日期:2019.11.1
the utilization of these operators in intermolecular radical–radical arylations, while avoiding conjugate addition/dimerization reactivity that is commonly encountered in enone-based photoredox chemistry. This reactivity relies on tertiary amines that serve to both activate the arylidene malonate for single-electron reduction by a proton-coupledelectrontransfer mechanism as well as serve as a terminal
Lewis Acid-Catalyzed [3+4] Annulation of 2-(Heteroaryl)- cyclopropane-1,1-dicarboxylates with Cyclopentadiene
作者:Olga A. Ivanova、Ekaterina M. Budynina、Alexey O. Chagarovskiy、Alexey E. Kaplun、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1002/adsc.201000783
日期:2011.5.9
A novel Lewisacid‐catalyzed [3+4] annulation of 2‐(heteroaryl)cyclopropane‐1,1‐dicarboxylates with cyclopentadiene is reported. This reaction proceeds via an electrophilic attack of the Lewisacid‐activated donor‐acceptor cyclopropane onto cyclopentadiene followed by Friedel–Crafts intramolecular alkylation of the heteroarene substituent. This is the first general example of reactions of donor‐acceptor
报道了一种新型的路易斯酸催化的2-(杂芳基)环丙烷-1,1-二羧酸酯与环戊二烯的[3 + 4]环化反应。该反应通过Lewis酸活化的供体-受体环丙烷对环戊二烯的亲电攻击,然后Friedel-Crafts杂芳烃取代基的分子内烷基化。这是供体-受体环丙烷反应的第一个一般示例,其中供体取代基充当亲核试剂。所描述的环空表示一种方便的方法,可将双杂芳烃环化为C(2)-C(3)键以生成双环[3.2.1]八-2,6-二烯。对于一系列的呋喃基,噻吩基,吡咯基,苯并呋喃基,苯并噻吩基和吲哚基取代的环丙烷证明了其效率。此外,在2-(5-甲基-2-呋喃基)环丙烷-1,1-二酯的情况下,我们观察到主要形成[3 + 4]环空或四环5,8-甲基环戊五烯[ a ]的产物] azulene衍生物,取决于反应条件。
Agent for stabilizing keratin fibers with 5-ring heterocycles
申请人:Henkel AG & Co. KGaA
公开号:US10561594B2
公开(公告)日:2020-02-18
The subject matter of the present disclosure are agents for stabilizing keratin fibers, more particularly human hair, containing in a cosmetic carrier:
(a) at least one compound of the formula (I)
wherein
X denotes oxygen (—O—), sulfur (—S—) or a grouping —NR5—.
本公开的主题是用于稳定含有化妆品载体的角蛋白纤维(尤其是人类头发)的制剂:
(a) 至少一种式(I)化合物
在其中
X 表示氧 (-O-)、硫 (-S-) 或基团 -NR5-。
AGENT FOR STABILIZING KERATIN FIBERS WITH 5-RING HETEROCYCLES
申请人:Henkel AG & Co. KGaA
公开号:US20180140525A1
公开(公告)日:2018-05-24
The subject matter of the present disclosure are agents for stabilizing keratin fibers, more particularly human hair, containing in a cosmetic carrier:
(a) at least one compound of the formula (I)
wherein
X denotes oxygen (—O—), sulfur (—S—) or a grouping —NR
5
—.