Highly efficient Ru(<scp>ii</scp>)–alkylidene based Hoveyda–Grubbs catalysts for ring-closing metathesis reactions
作者:Mariam Y. Al-Enezi、Elizabeth John、Yehia A. Ibrahim、Nouria A. Al-Awadi
DOI:10.1039/d1ra07428h
日期:——
Three novel phosphine-free Ru-alkylidenes (7a–7c) have been synthesized and utilized as efficient catalysts for ring closing metathesis (RCM) reaction. Spectroscopic data, i.e. NMR and HRMS, along with single crystal X-ray diffraction analysis, were used to confirm their chemical structures. The tosylated carbenoid 7b showed the highest efficiency in cyclizing different acyclic diene substrates. RCM
已经合成了三种新型的不含膦的 Ru-亚烷基 ( 7a-7c ),并将其用作闭环复分解 (RCM) 反应的有效催化剂。光谱数据,即NMR 和 HRMS,以及单晶 X 射线衍射分析,用于确认它们的化学结构。甲苯磺酰化的类胡萝卜素7b在环化不同的无环二烯底物方面表现出最高的效率。与众所周知的 Grubbs 相比,仅使用催化量 (0.5–2.0 mol%) 的添加剂催化剂 ( 7b ) 就可以很好地耐受各种(未)取代的N、N-二烯丙基苯胺衍生物的 RCM 和不同大分子二烯的立体选择性 RCM (II) 和 Hoveyda-Grubbs (II) 催化剂。
1,2-Aminohalogenation of arynes with amines and organohalides
作者:Sheng-Jun Li、Lu Han、Shi-Kai Tian
DOI:10.1039/c9cc05505c
日期:——
An unprecedented three-component reaction of amines, arynes, and organohalides provides convenient access to structurally diverse tertiary 2-haloanilines.
一种前所未有的三组分反应,涉及胺、芳炔和有机卤化物,为结构多样的三级2-卤代苯胺提供了便捷的途径。
Fast Tin-Free Hydrodehalogenation and Reductive Radical Cyclization Reactions: A New Reduction Process
作者:Santiago E. Vaillard、Al Postigo、Roberto A. Rossi
DOI:10.1021/jo035477i
日期:2004.3.1
The photostimulated reactions of several aryl and alkyl chlorides and bromides with the monoanion of reduced ethyl benzoate 5H furnish the reduced products in high yields. If the aryl moieties have suitable double bonds, the cyclized reduced products are obtained in high yields. The photostimulated reaction of 1-allyloxy-2-bromobenzene (1a) with 5H affords 3-methyl-2,3-dihydro-benzofuran (2a) in 97%
Procédé de désallylation des N-allylanilines et des N,N-diallylanilines par des métaux
申请人:RHONE-POULENC CHIMIE
公开号:EP0378463A1
公开(公告)日:1990-07-18
La présente invention concerne un procédé de désallylation de N-allylanilines.
Cette désallylation est effectuée en présence de métaux choisis parmi le cuivre ou le palladium dans un solvant aqueux ou alcoolique.
Syntheses of 3-Substituted 2,3-Dihydrobenzofuranes, 1,2-Dihydronaphtho(2,1-<i>b</i>)furanes, and 2,3-Dihydro-1<i>H</i>-indoles by Tandem Ring Closure−S<sub>RN</sub>1 Reactions
作者:Santiago E. Vaillard、Al Postigo、Roberto A. Rossi
DOI:10.1021/jo026404m
日期:2002.11.1
3-Substituted 2,3-dihydrobenzofuranes (7a-c), 1,2-dihydronaphtho(2,1-b)furanes (10a-c), and N-substituted 2,3-dihydro-1H-indoles (8a-c, 9a,b) are obtained in very good yields by S(RN)1 photostimulated reactions in liquid ammonia from adequate haloaromatic compounds ortho-substituted with a suitable double bond (3a,b; 4a,b; 5a; 6a,b) and Me3Sn-, Ph2P-, and -CH2NO2 anions. The novelty of the work involves the versatile application of a 5-exo ring closure process during the propagation cycle of the SRN1 reaction; the alkyl radical intermediates formed react with the nucleophiles to afford the ring closure-substituted heterocycles. The factors governing the observed product distribution are discussed.