The Synthesis of C2-Symmetric and Axially Chiral Compounds for Recognition and Catalysis
摘要:
Axially chiral amidines and guanidines. some possessing C-2-symmetry, have been targeted as potential chiral catalysts for reactions of alpha,beta -unsaturated carboxylic acids or esters. The key step in each synthesis required the coupling of two sterically demanding aromatic compounds to form atropisomeric biaryl species. (C) 2000 Elsevier Science Ltd. All rights reserved.
room temperature. It also shows amphoteric redox behavior, with a small electrochemical energy gap (1.33 eV). Its electronic structure and physical properties are compared with those of Anthony's nonacene derivative JA-NA and other zethrene derivatives. A more general comparison between higher order acenes and extended zethrenes was also conducted on the basis of ab initio electronic structure calculations
[EN] MONOPHOSPHORUS LIGANDS AND THEIR USE IN CROSS-COUPLING REACTIONS<br/>[FR] LIGANDS À UN ATOME DE PHOSPHORE ET LEUR UTILISATION DANS DES RÉACTIONS DE COUPLAGE CROISÉ
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2011126917A1
公开(公告)日:2011-10-13
Phosphine ligands of the formula Ia, IB and mixtures thereof.
化学配体的化学式Ia、IB及其混合物。
A Highly Active Suzuki Catalyst for the Synthesis of Sterically Hindered Biaryls: Novel Ligand Coordination
作者:Jingjun Yin、Matthew P. Rainka、Xiao-Xiang Zhang、Stephen L. Buchwald
DOI:10.1021/ja017082r
日期:2002.2.1
A catalyst system for the preparation of biaryls containing four ortho substituents via Suzuki coupling is described. The combination of a catalytic quantity of Pd2(dba)3 with either an electron-rich biarylphosphine or DPEPhos is effective using a wide range of substrates. The X-ray crystal structure of (dba)Pd(2-(9-phenanthryl)phenyl-dicyclohexylphosphine), in which the Pd is coordinated to the 9
A new preparative procedure for 5-aryl- or 5-decylquinolin-8-ols was developed. The key step of the procedure is the cross coupling of 8-benzyloxy-5-bromoquinoline with arylboronic acid or 9-decyl-9-borabicyclo[3.3.1]nonane (Suzuki reaction). Deprotection of the benzyloxy group was accomplished successfully by Pd/C catalyzed hydrogen transfer from cyclohexa-1,4-diene.
Compounds of formula (I)
1
or pharmaceutically acceptable salts thereof, inhibit farnesyltransferase. Methods for making the compounds, pharmaceutical compositions containing the compounds, and methods of treatment using the compounds are disclosed.