Synthesis and Characterization of Axially Chiral Imidazoisoquinolin-2-ylidene Silver and Gold Complexes
摘要:
The selective Suzuki cross-coupling of 1,3-dichloroisoquinoline with 2-substituted 1-naphthylboronic acids/esters followed by construction of the imidazo[1,5-b]isoquinoline ring and alkylation constitutes a straightforward route to imidazolium salts fused into an axially chiral biaryl skeleton. Metalation of these azolium salts afforded the corresponding NHC silver complexes, which were used as carbene transfer agents for the synthesis of Au(I) derivatives.
CuX2-mediated [4+2] benzannulation as a new synthetic tool for stereoselective construction of haloaromatic compounds
摘要:
The CuX2-mediated reaction of enynal units, including ortho-alkynylbenzaldehydes, with alkynes gives a variety of haloaromatic compounds stereoselectively in good to high yields. 2,2'-Binaphthyl skeletons are also readily prepared by the reaction of ortho-alkynylbenzaldehydes and diynes. The method was applied to the synthesis of poly-substituted tetracene derivatives (C) 2009 Elsevier Ltd. All rights reserved