Synthesis of 2,3-acetylenic amines by aminomethylation of acetylenes with geminal diamines
摘要:
A general and effective procedure has been developed for the synthesis of symmetrical and unsym- metrical 2,3-acetylenic amines by aminomethylation of terminal mono- and diacetylenes with geminal diamines in the presence of transition metal salts and complexes.
Recyclable Cu/C<sub>3</sub>N<sub>4</sub> composite catalyzed AHA/A<sup>3</sup> coupling reactions for the synthesis of propargylamines
作者:Hang Xu、Jun Wang、Peng Wang、Xiyu Niu、Yidan Luo、Li Zhu、Xiaoquan Yao
DOI:10.1039/c8ra06613b
日期:——
be efficient for the synthesis of propargylamines using a three-componentcouplingreaction of alkynes, CH2Cl2 and amines (AHA) without additional base. Moreover, the catalyst also showed highly catalytic activity in the synthesis of C1-alkynylated tetrahydroisoquinolines (THIQs) via an A3 reaction of alkynes, aldehydes and THIQ. The Cu/C3N4-catalyzed multicomponent reactions exhibited good functional
发现非均相 Cu/C 3 N 4催化剂可有效合成炔丙基胺,使用炔烃、CH 2 Cl 2和胺 (AHA) 的三组分偶联反应,无需额外碱。此外,该催化剂在通过炔烃、醛和 THIQ的 A 3反应合成 C1-炔基化四氢异喹啉 (THIQ) 中也表现出高度催化活性。Cu/C 3 N 4催化的多组分反应在大多数例子中表现出良好的官能团耐受性。此外,容易制备的 Cu/C 3 N 4催化剂可以方便地回收和重复使用5次以上而不会失去催化活性。
NbCl5-Mg Reagent System in Regio- and Stereoselective Synthesis of (2Z)-Alkenylamines and (3Z)-Alkenylols from Substituted 2-Alkynylamines and 3-Alkynylols
作者:Rita N. Kadikova、Azat M. Gabdullin、Oleg S. Mozgovoj、Ilfir R. Ramazanov、Usein M. Dzhemilev
DOI:10.3390/molecules26123722
日期:——
(2Z)-alkenylamine and (3Z)-alkenylol derivatives in high yields in a regio- and stereoselective manner through the deuterolysis (or hydrolysis). The reaction of substituted propargylamines and homopropargylic alcohols with the in situ generated low-valent niobium complex (based on the reaction of NbCl5 with magnesium metal) is an efficient tool for the synthesis of allylamines and homoallylic alcohols bearing a 1,2-disubstituted
Copper-catalyzed Mannichreactions of terminal alkynes and secondary amines with aqueous formaldehyde can be accelerated by the use of a catalytic amount of an imidazole ligand carrying a long alkyl chain. The alkyl chain shows an efficient steric effect and helps the reaction. This imidazole ligand is efficient for various substrates, including even bulky alkynes.
Titanium(IV) isopropoxide and ethylmagnesium bromide catalyzed reaction of 2-alkynylamines with Et2Zn, followed by deuterolysis/hydrolysis and iodinolysis, affords substituted (Z)-pent-2-en-2,5-d 2-1-amines, (Z)-pent-2-en-1-amines (65–88%), and substituted (Z)-2,5-diiodopent-2-en-1-amines (55–63%). It is suggested that the reaction proceeds through the formation of cyclic organotitanium derivatives. The
Mild and efficient synthesis of propargylamines by copper-catalyzed Mannich reaction
作者:Lothar W. Bieber、Margarete F. da Silva
DOI:10.1016/j.tetlet.2004.09.079
日期:2004.11
Terminal alkynes undergo mild and efficient aminomethylation with aqueous formaldehyde and secondary amines under CuI catalysis. In most cases high to nearly quantitative yields of tertiary propargylamines are obtained in DMSO solution at room temperature. Aromatic, aliphatic and silylated acetylenes as well as alkynols can be used. Primary amines are less reactive and satisfactory yields of secondary propargylamines