Rhodium-Catalyzed Linear Cross-Trimerization of Two Different Alkynes with an Alkene and Two Different Alkenes with an Alkyne
作者:Masayuki Kobayashi、Ken Tanaka
DOI:10.1002/chem.201200903
日期:2012.7.23
paths with rhodium: A cationic RhI/H8‐BINAPcomplex has been found to catalyze the linear cross‐trimerization of terminal alkynes, acetylenedicarboxylates, and acrylamides to give substituted trienes. The asymmetric linear cross‐trimerization, giving substituted chiral dienes, has also been achieved by using monosubstituted alkenes and (R)‐BINAP instead of terminal alkynes and H8‐BINAP (see scheme;
与铑的交叉路径:阳离子Rh I / H 8 ‐BINAP络合物可催化末端炔烃,乙炔二羧酸酯和丙烯酰胺的线性交叉三聚反应,生成取代的三烯。还可以通过使用单取代的烯烃和(R)-BINAP代替末端炔烃和H 8 -BINAP(参见方案; H 8 -BINAP = 2,2'-bis )来实现不对称线性交叉三聚,得到取代的手性二烯。(二苯基膦基)-5,5',6,6',7,7',8,8'-八氢-1,1'-联萘基; BINAP = 2,2'-双(二苯基膦基)-1,1'-联萘]]。
Exploration of [2 + 2 + 2] cyclotrimerisation methodology to prepare tetrahydroisoquinoline-based compounds with potential aldo–keto reductase 1C3 target affinity
作者:Ana R. N. Santos、Helen M. Sheldrake、Ali I. M. Ibrahim、Chhanda Charan Danta、Davide Bonanni、Martina Daga、Simonetta Oliaro-Bosso、Donatella Boschi、Marco L. Lolli、Klaus Pors
DOI:10.1039/c9md00201d
日期:——
Tetrahydroisoquinoline (THIQ) is a key structural component in many biologically active molecules including natural products and synthetic pharmaceuticals.
四氢异喹啉(THIQ)是许多生物活性分子中的一个关键结构成分,包括天然产物和合成药物。
A Highly Practical <i>Instant</i> Catalyst for Cyclotrimerization of Alkynes to Substituted Benzenes
see text] A 2-(2,6-diisopropylphenyl)iminomethylpyridine (1a)/CoCl(2).6H(2)O/Zn reagent has been developed as an effective instant catalyst for the intra- and intermolecular cyclotrimerization of alkynes to substituted benzenes, making the method extremely practical since the reagent, 1a/CoCl(2).6H(2)O/Zn, is inexpensive and easy to handle and the reaction is less sensitive to moisture and is reasonably
Cobalt cyclopentadienyl complexes incorporating a fumarate and a CO ligand (see picture) efficiently catalyze inter‐ and intramolecular [2+2+2] cycloadditions of alkynes, nitriles, and/or alkenes to give benzenes, pyridines, or 1,3‐cyclohexadienes. Unlike catalysts such as [CpCo(CO)2] or [CpCo(C2H4)2] (Cp=C5H5), they are air‐stable, easy to handle, compatible with microwave conditions, and do not necessarily
结合富马酸酯和CO配体的环戊二烯钴复合物(见图)有效地催化炔烃,腈和/或烯烃的分子间和分子内[2 + 2 + 2]环加成反应,从而生成苯,吡啶或1,3-环己二烯。与[CpCo(CO)2 ]或[CpCo(C 2 H 4)2 ](Cp = C 5 H 5)等催化剂不同,它们具有空气稳定性,易于处理,与微波条件兼容,并且不一定需要辐射才能活跃。
CpCo(CO)2-catalysed cyclotrimerisation of alkynes in supercritical carbon dioxide
作者:Francisco Montilla、Teresa Avilés、Teresa Casimiro、Ana Aguiar Ricardo、Manuel Nunes da Ponte
DOI:10.1016/s0022-328x(01)00856-7
日期:2001.8
complex CpCo(CO)2 as catalyst. The reaction of phenylacetylene produced a mixture of the isomeric cyclotrimers 1,3,5- (2a) and 1,2,4-triphenylbenzene (2a′), in a 1:5 ratio, and traces of cobaltcyclopentadienone complexes CpCo(η4-C4H2[Ph]2CO) (6a, mixture of isomers). The possible product formed by the incorporation of CO2 to alkynes, i.e. diphenylpyrone (7a) was not observed. The reaction of the cobaltacyclopentadiene