Facile and Selective Synthesis of Propargylic Amines and 1,6-Diynes: One-Pot Three-Component Coupling Reactions of Alkynylsilanes, Aldehydes and Amines by a Cooperative Catalytic System Comprised of CuCl and Cu(OTf)2
摘要:
Described herein is a three-component coupling reaction of alkynylsilanes, aldehydes and amines by a cooperative catalytic system comprised of CuCl and Cu(OTf)(2), leading to the production of a variety of propargyl amine derivatives. This catalytic system was successfully applied to the practical preparation of 1,6-diyne derivatives via twice-performed, domino-type coupling reactions.
Site-Selective Labeling of Native Proteins by a Multicomponent Approach
作者:Maheshwerreddy Chilamari、Landa Purushottam、Vishal Rai
DOI:10.1002/chem.201605938
日期:2017.3.17
functionalization of proteins is an indispensable tool. Yet, selective labeling of native proteins has been an arduous task. The limited success of chemical methods allows N‐terminus protein labeling, but the examples with side‐chain residues are rare. Herein, we surpass this challenge through a multicomponent transformation that operates under physiological conditions in the presence of a protein, aldehyde, acetylene
Mild and Catalyst-Free Petasis/Decarboxylative Domino Reaction: Chemoselective Synthesis of <i>N</i>-Benzyl Propargylamines
作者:Huangdi Feng、Huihui Jia、Zhihua Sun
DOI:10.1021/jo502349a
日期:2014.12.5
domino reactions are attractive for assembling functionalized compounds. To this end, a one-pot catalyst-free chemoselective synthesis of N-benzyl propargylamines is reported with good functional group compatibility. This mild process involves in situ formation of an active amine through Petasisreaction of primary amines, formaldehyde solution, and boronic acids, which reacts with propiolic acids to give
Disclosed is a process for production of a substituted benzene, which comprises intramolecularly and/or intermolecularly trimerizing a triple bond in an alkyne in the presence of a transition metal catalyst to yield a substituted benzene compound. In the process, the transition metal catalyst is prepared from an iminomethylpyridine represented by the formula (1) or (2), a transition metal salt or a hydrate thereof, and a reducing agent in a reaction system and is used to perform the trimerization. The process can be used in any one of the intramolecular cyclization of a triyne compound, the cyclization of a diyne compound or an alkyne compound and the intermolecular cyclization of three molecules of an alkyne compound, is excellent in economic effectiveness and operability, and is practically advantageous.
wherein R
1
and R
3
independently represent a linear or cyclic C
1
-C
20
aliphatic hydrocarbon group or the like; R
2
represents a hydrogen atom or the like; X represents a hydrogen atom, O or the like; and Y represents O, S or the like.
Easily prepared and air-stable methylidynetricobaltnonacarbonyl could be used as a catalyst for the intramolecular [2 + 2 + 1]-cocyclization of diynes and carbon monoxide producing cyclopentadienones.
Facile and Selective Synthesis of Propargylic Amines and 1,6-Diynes: One-Pot Three-Component Coupling Reactions of Alkynylsilanes, Aldehydes and Amines by a Cooperative Catalytic System Comprised of CuCl and Cu(OTf)<sub>2</sub>
作者:Norio Sakai、Naoki Uchida、Takeo Konakahara
DOI:10.1055/s-2008-1077790
日期:2008.6
Described herein is a three-component coupling reaction of alkynylsilanes, aldehydes and amines by a cooperative catalytic system comprised of CuCl and Cu(OTf)(2), leading to the production of a variety of propargyl amine derivatives. This catalytic system was successfully applied to the practical preparation of 1,6-diyne derivatives via twice-performed, domino-type coupling reactions.