Hydroamination of isocyanates and isothiocyanates by alkaline earth metal initiators supported by a bulky iminopyrrolyl ligand
作者:Kulsum Bano、Srinivas Anga、Archana Jain、Hari Pada Nayek、Tarun K. Panda
DOI:10.1039/d0nj01509a
日期:——
A series of new heteroleptic alkalineearth (Ae) metal complexes of general formula [(Ph2CHNCH)2C4H2N}AeI(THF)3] Ae = Ca (2), Sr (3), and Ba (4)} were synthesized via salt metathesis by reacting potassium salt of ligand 1-K [(Ph2CHNCH)2C4H2N}K(THF)2] with anhydrousalkalineearthmetal diiodides (AeI2). The homoleptic calcium and barium complexes [(Ph2CHNCH)2C4H2N}2Ae] [Ae = Ca (5), Ba (6)] were
一系列新的通式为[(Ph 2 CHN CH)2 C 4 H 2 N} AeI(THF)3的杂碱土金属(Ae)金属配合物Ae = Ca(2),Sr(3)和通过配位1-K [((Ph 2 CHN CH)2 C 4 H 2 N} K(THF)2 ]的钾盐与无水碱土金属二碘化物(AeI 2)反应,通过盐复分解反应合成Ba(4)} 。均钙和钡复合物[(Ph 2 CHN CH)2 C 4 H 2 N} 2 Ae] [Ae = Ca( 5),Ba( 6)]是通过用质子处理金属双六甲基二硅叠氮化物[Ae N(SiMe 3) 2 } 2(THF) 2 ]制备的摩尔比为1的配体1-H [(Ph 2 CH–NCH) 2 C 4 H 2 NH]。钙络合物5 用作活性预催化剂,在纯净条件下,在杂枯烯(如苯基异氰酸酯(PhNCO)和苯基异硫氰酸酯(PhNCS))上加成芳基胺的N–H键,其相应尿素和硫脲衍生物的收率高达99%获得。
Preparation of 2-Azido-1-Substituted-1 <i>H</i>-Benzo[<i>d</i>]imidazoles Using a Copper-Promoted Three-Component Reaction and Their Further Conversion into 2-Amino and 2-Triazolyl Derivatives
作者:Tamminana Ramana、Tharmalingam Punniyamurthy
DOI:10.1002/chem.201202215
日期:2012.10.15
Multicomponent reaction: 2‐Azido‐1‐substituted‐1H‐benzo[d]imidazoles were prepared using a copper‐catalyzed three‐component reaction involving 2‐bromoaniline derivatives, isothiocyanates, and sodium azide. The reaction conditions were mild and the scope was broad. The azido compounds were transformed into their 2‐amino and 2‐triazolyl derivatives using copper‐mediated reduction and cycloaddition, respectively
多组分反应:使用2-铜苯胺衍生物,异硫氰酸盐和叠氮化钠的铜催化三组分反应制备2-叠氮基-1-取代-1 H-苯并[ d ]咪唑。反应条件温和,适用范围广。分别通过铜介导的还原和环加成将叠氮基化合物转化为它们的2-氨基和2-三唑基衍生物(参见方案)。
Ligand-Free Copper-Catalyzed Synthesis of Substituted Benzimidazoles, 2-Aminobenzimidazoles, 2-Aminobenzothiazoles, and Benzoxazoles
The synthesis of substituted benzimidazoles, 2-aminobenzimidazoles, 2-aminobenzothiazoles, and benzoxazoles is described via intramolecularcyclization of o-bromoaryl derivatives using copper(II) oxide nanoparticles in DMSO under air. The procedure is experimentally simple, general, efficient, and free from addition of external chelating ligands. It is a heterogeneous process and the copper(II) oxide
Synthesis of 4-substituted imino-4H-benzo[d][1,3] thiazin-2-amines via palladium-catalysed isocyanide insertion in 2-bromophenylthioureas
作者:Garima Pandey、Subhendu Bhowmik、Sanjay Batra
DOI:10.1039/c4ra06875k
日期:——
The palladium-catalysed isocyanide insertion in 2-bromophenylthioureas leads to the formation of 4-substituted imino-4H-benzo[d][1,3]thiazin-2-amines via C–S cross coupling reaction of the intermediate imidoylpalladium species.
2-Amino-, and 2-alkyl-benzothiazoles have been efficiently prepared by palladium catalyzed cyclization of o-bromophenylthioureas and o-bromophenylthiamides. Results were best with the Pd-2(dba)(3)/monophosphine catalytic system. (C) 2003 Elsevier Ltd. All rights reserved.