Preparation of Benzolactams by Pd(OAc)2-Catalyzed Direct Aromatic Carbonylation
摘要:
We developed a new method for Pd(II)-catalyzed direct aromatic carbonylation in a phosphine-free catalytic system using Pd(OAc)2 and Cu(OAc)2 in an atmosphere of CO gas containing air. The carbonylation proceeded with ortho-palladation, inducing a remarkable site selectivity to afford a variety of five- or six-membered benzolactams from secondary omega-arylalkylamines, such as N-alkylbenzylamines or N-alkylphenethylamines.
The present invention relates to a process for the preparation of 5-aryl tetrazoles of the formula: ##STR1## or a salt thereof comprising reacting an aryl nitrile with a trisubstituted silyl azide and a disubstituted tin oxide.
phenethylamine derivatives, underwent a direct aromatic carbonylation to afford five- or six-membered benzolactams. In the carbonylation, the chelation effect or steric repulsion between Pd(II) and the meta-substituent in the ortho-palladation and the ring sizes of cyclopalladation products that were formed prior to carbonylation were found to generate good site selectivity and increase the reaction rate. In
Preparative Fluorous Mixture Synthesis of Diazonium-Functionalized Oligo(phenylene vinylene)s
作者:Huahua Jian、James M. Tour
DOI:10.1021/jo048051s
日期:2005.4.1
were made to bear aryl diazonium functionalities that allow them to be used as surface grafting moieties in hybrid silicon/molecule assemblies. A library of OPV and hybrid oligomer tetramers was synthesized using fluorous mixture synthesis (FMS). The fluorous tags, which are secondaryamines bearing different numbers of fluorine atoms, were synthesized and used as phase tags in mixture synthesis. The
An Efficient Synthesis of an Angiotensin II Antagonist (A-81988)
作者:Francis A. J. Kerdesky、Anthony Haight、B. A. Narayanan、Carl W. Nordeen、David Scarpetti、Louis S. Seif、Steven Wittenberger、Howard E. Morton
DOI:10.1080/00397919308009863
日期:1993.7
Abstract A new and efficient synthesis of A-81988, an angiotensinIIantagonist, is described. The preparation utilizes a novel method for tetrazole formation from nitriles requiring trimethylsilyl...
摘要 描述了一种新的、有效的血管紧张素 II 拮抗剂 A-81988 的合成方法。该制备利用一种新方法从需要三甲基甲硅烷基的腈类中形成四唑...
1,3-oxazolyl substituted biphenyl
申请人:Abbott Laboratories
公开号:US05210206A1
公开(公告)日:1993-05-11
The present invention relates to a process for the preparation of a compound of the formula: ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen, loweralkyl, loweralkoxy-substituted loweralkyl, lower alkenyl, lower alkynyl, cycloalkyl and cycloalkylalkyl; R.sub.2 is selected from the group consisting of hydrogen, loweralkyl, loweralkoxy-substituted loweralkyl, halogen and loweralkoxy; R.sub.3 is selected from hydrogen, loweralkyl, and halogen; R* and R** are independently selected from loweralkyl and P.sub.1 is hydrogen or an nitrogen-protecting group; or an acid addition salt thereof.