Switchable C–H Functionalization of N-Tosyl Acrylamides with Acryloylsilanes
摘要:
A controllable Rh-catalyzed protocol to access alkylation and akenylation-annulation off N-tosyl acrylamide with, acryloyl silane is reported. In contrast to the directing group or catalyst-dependent divergent sp(2) C-H alkylation/alkenylation the instrinsic property of acryloylsilane allows the switchable reaction manifold, thereby affording either alkylation or alkylation Products with slight modification of the reaction conditions.
A RhIII‐catalyzed intramolecularoxidative cross‐coupling between double bonds for the synthesis of macrolides is described. Under the optimized reaction conditions, macrocycles containing a diene moiety can be formed in reasonable yields and with excellent chemo‐ and stereoselectivity. This method provides an efficient approach to synthesize macrocyclic compounds containing a 1,3‐conjugated diene
作者:Qi-Liang Yang、Yi-Kang Xing、Xiang-Yang Wang、Hong-Xing Ma、Xin-Jun Weng、Xiang Yang、Hai-Ming Guo、Tian-Sheng Mei
DOI:10.1021/jacs.9b11915
日期:2019.12.4
Synergistic use of electrochemistry and organometallic catalysis has emerged as a powerful tool for site-selective C-H functionalization, yet this type of transformation has thus far mainly been limited to arene C-H functionaliza-tion. Herein, we report the development of electrochemi-cal vinylic C-H functionalization of acrylic acids with al-kynes. In this reaction an iridium catalyst enables C-H/O-H
Directing-Group-Assisted Copper-Catalyzed Olefinic Trifluoromethylation of Electron-Deficient Alkenes
作者:Chao Feng、Teck-Peng Loh
DOI:10.1002/anie.201307245
日期:2013.11.18
Assistance provided: The directing group in the title reaction not only activates the substrates but also allows the stereospecific formation of cis‐trifluoromethylated products. The reaction is operationally simple and tolerates a wide variety of functional groups, thus providing an efficient method for the stereoselective synthesis of β‐CF3‐functionalized acrylamide derivatives.
Spirobenzylamine-Phosphine, Preparation Method Therefor And Use Thereof
申请人:Zhou Qilin
公开号:US20140194638A1
公开(公告)日:2014-07-10
The present invention relates to a spirobenzylamine-phosphine, preparation method therefor and use thereof. The compound has a structure represented by formula (I), wherein n=0 to 3; R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
and R
9
having a value as defined in claim
1
. Starting from the substituted 7-trifluoromesyloxy-7′-diarylphosphino-1,1′-spiro-dihydroindene, the compound is synthesized in a two-step or three-step reactions. The new spirobenzylamine-phosphine is complexed with an iridium precursor and is subjected to ion exchange, to give an Iridium/spirobenzylamine-phosphine complex comprising various anions. The spiro benzyl amine-phosphine/Iridium complex according to the present invention may be used for catalyzing asymmetry hydrogenation of a variety of alpha-substituted acrylic acids, has high activity and enantio-selectivity, and has a good prospect of industrialization.
[EN] UNIVERSAL METHYLATION PROFILING METHODS<br/>[FR] PROCÉDÉS UNIVERSELS DE PROFILAGE DE LA MÉTHYLATION
申请人:UNIV COLUMBIA
公开号:WO2014204861A1
公开(公告)日:2014-12-24
The present invention provides a compound having the adenosylmethionine structure, wherein the sulfur atom of the methionine moiety is modified with alkene or succinimide groups, wherein R1, R2 and R3 are independently H, alkyl, aryl, C(0)NH2, C(0)R', CN, N02, C (O)R', S(0),NHR'; wherein X is 0 or NR'; wherein R' is H, alkyl or aryl; and wherein n is an integer from 1 to 8, with the proviso that, when substituent is a propene derivative, and n is 1, at least one of R1, R2, or R3 is other than H.