A Study of the Reactions of 3‐Bromopropenals with Anilines for the Synthesis of α‐Bromo Enaminones
作者:Sundaram Suresh、Prakash Bhimrao Patil、Pao‐Hsing Yu、Chia‐Chi Fang、Yin‐Zhi Weng、Veerababurao Kavala、Ching‐Fa Yao
DOI:10.1002/adsc.202100779
日期:2021.11.9
The reactions proceed via the p-toluenesulfonic acid monohydrate (TsOH ⋅ H2O) catalyzed reactions of 3-bromopropenals with anilines in dimethyl sulfoxide (DMSO) and does not require an external brominating agent. The chemoselective 1,2-addition was accomplished by employing aniline with a sterically hindered electron-withdrawing group attached at the ortho-position. In addition, the reactions involving
One-Pot Synthesis of Pyrimidines via Cyclocondensation of β-Bromovinyl Aldehydes with Amidine Hydrochlorides
作者:Shengjiao Yan、Yajuan Tang、Fuchao Yu、Jun Lin
DOI:10.1002/hlca.201000264
日期:2011.3
A series of pyrimidines were prepared by cyclocondensation of β‐bromovinyl aldehydes with amidinehydrochlorides in the presence of Et3N in excellent yields (74–95%).
Copper and Rhodium Relay Catalysis for Selective Access to <i>cis</i>-2,3-Dihydroazepines
作者:You Li、Han Luo、Zongyuan Tang、Yingzi Li、Luan Du、Xiaolan Xin、Shanshan Li、Baosheng Li
DOI:10.1021/acs.orglett.1c02262
日期:2021.8.20
access synthetically challenging cis-2,3-dihydroazepines is reported. The reaction starts with readily available dienals, alkynes, and sulfonyl azides as the substrates and employs copper and rhodium as relay catalysts. Key steps include a copper-catalyzed reaction between an alkyne and a sulfonyl azide to form a triazole intermediate. The subsequent activation of this triazole intermediate by a rhodium
One-Pot Tandem Amidation, Knoevenagel Condensation, and Palladium-Catalyzed Wacker Type Oxidation/C–O Coupling: Synthesis of Chromeno-Annulated Imidazopyridines
作者:Khima Pandey、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.joc.8b00884
日期:2018.8.3
direct one-potsynthesis of chromeno-annulated imidazo[1,2-a]pyridines is achieved by the reaction of 2-amino-1-(2-ethoxy-2-oxoethyl)pyridinium salts with 2-bromoarylaldehydes using Pd(TFA)2 as a catalyst and Cu(OAc)2 as an oxidant. The overall strategy involves tandem base-mediated amidation and Knoevenagel condensation, followed by palladium-catalyzed Wacker type oxidation and intramolecular C–O coupling
通过使用Pd(TFA)使2-氨基-1-(2-乙氧基-2-氧乙基)吡啶鎓盐与2-溴芳基醛反应,可直接合成一氧化铬修饰的咪唑并[1,2- a ]吡啶)2作为催化剂,Cu(OAc)2作为氧化剂。总体策略涉及串联碱基介导的酰胺化和Knoevenagel缩合,然后进行钯催化的Wacker型氧化和分子内C–O偶联反应。该方法简单,耐受不同的官能团,并给出中等程度到良好的产色量[2',3':4,5]咪唑并[1,2 - a ]吡啶-12-衍生物。发达的串联反应也成功地用于合成吡喃并稠合的咪唑并[1,2- a]。通过使用3-溴-3-芳基丙烯醛制备]吡啶。
A facile synthesis of benzo[b][1,4]thiazepine derivatives by palladium acetate catalyzed reaction
作者:Partha Pratim Kaishap、Kommuri Shekarrao、Pallabi Saikia、Sanjib Gogoi、Romesh C. Boruah
DOI:10.1016/j.tetlet.2014.01.153
日期:2014.3
The preparation of steroid/nonsteroid fused benzo[b][1,4]thiazepines and 2-arylsubstituted benzo[b][1,4]thiazepines is described from Pd(OAc)2 catalyzed reaction of steroidal/nonsteroidal β-halovinyl aldehydes and 2-aminothiophenols in DMF under heating condition.
由Pd(OAc)2催化甾体/非甾体β-卤代戊二醛与Pd(OAc)2的反应,描述了甾体/非甾体稠合的苯并[ b ] [1,4]硫氮杂和2-芳基取代的苯并[ b ] [1,4]硫氮杂的制备。加热条件下,DMF中的2-氨基硫酚。