Palladium-Catalyzed Formal [4 + 1] Annulation via Metal Carbene Migratory Insertion and C(sp<sup>2</sup>)–H Bond Functionalization
作者:Shuai Xu、Ri Chen、Zihao Fu、Qi Zhou、Yan Zhang、Jianbo Wang
DOI:10.1021/acscatal.6b03562
日期:2017.3.3
A highly efficient and operationally simple palladium-catalyzed formal [4 + 1] annulationreaction has been developed. The reaction is featured by the formation of two different C–C bonds on a carbenic center. It represents a concise method for the synthesis of a wide range of polycyclic aromatic hydrocarbons (PAHs) and 1H-indenes with easily available (trimethylsilyl)diazomethane as the carbene source
The present invention relates to tricyclic compounds each represented by the following formula (I):
(wherein, R1, R2, R2', R3, R4, X, Y and Z have the same meanings as defined in the specification); and a drug containing the compound.
Since the compounds according to the present invention exhibit an excellent squalene synthetase inhibitory effect and cholesterol synthesis inhibitory effect so that they are useful as a drug such as preventive and/or remedy for diseases in mammals including humans such as hyperlipemia, e.g., hypercholesterolemia, hypertriglyceridemia, and low HDL cholesterolemia and/or arteriosclerosis.
Palladium-Catalyzed Annulation of Aryl Heterocycles with Strained Alkenes
作者:David G. Hulcoop、Mark Lautens
DOI:10.1021/ol070475w
日期:2007.4.1
An annulation reaction proceeding by the intermolecular addition of an arylpalladium(II) halide across a strained alkene, followed by an intramolecular C-H functionalization of a pendant heterocycle is described. A variety of polycyclic heterocycles have been prepared from readily accessible haloaryl heterocycles by annulation with a range of strained alkene partners.
C−H Bond Functionalization in the Synthesis of Fused 1,2,3-Triazoles
A highly modular approach to fused 1,2,3-triazoles has been developed featuring a one-pot procedure combining copper(I) catalyzed azide-alkyne cycloaddition and palladium-catalyzed C-H bond functionalization. A class of structurally unique heterocycles was synthesized in good yields.
Synthesis of 4-Amino-6-aryl-6H-pyrrolo[1,2-a][1]benzazepine-5-carbonitriles from 1-(2-Bromophenyl)-1H-pyrroles and Arylidenemalononitriles
A convenient method for the preparation of 4-amino-6-aryl-6H-pyrrolo[1,2-a][1]benzazepine-5-carbonitriles has been developed. The method is based on the hydrogen bromide-mediated cyclization reaction of 2-aryl[2-(1H-pyrrol-1-yl)phenyl]methyl}propanedinitriles, produced by the treatment of 2-(1H-pyrrol-1-yl)phenyllithiums with arylidenemalononitriles. The lithium compounds can be easily generated by the bromine/lithium exchange between 1-(2-bromophenyl)-1H-pyrroles and butyllithium.