Tandem Approach to Benzothieno- and Benzofuropyridines from o-Alkynyl Aldehydes via Silver-Catalyzed 6-endo-dig Ring Closure
摘要:
An operationally simple silver-catalyzed tandem strategy for the synthesis of benzothienopyridines 7a-t and benzofuropyridines 8a-p by the reaction of o-alkynyl aldehyde 4a-t and 5a-p with tert-butylamine 6 under mild reaction conditions is described. The present methodology provides a facile conversion of easily accessible o-alkynyl aldehydes into medicinally useful heterocycles in good to excellent yields under mild and environmentally friendly reaction conditions with excellent regioselectivity. The developed chemistry has been successfully extended for the selective synthesis of C-4 deuterated benzothienopyridines 7u-v and benzofurop-yridines 8q-r. The role of the ethanolic proton in the reaction was validated by deuterium-labeling experiments.
Palladium meets copper: one-pot tandem synthesis of pyrido fused heterocycles via Sonogashira conjoined electrophilic cyclization
作者:Sonu Kumar、Rakesh K. Saunthwal、Trapti Aggarwal、Siva K. Reddy Kotla、Akhilesh K. Verma
DOI:10.1039/c6ob01539e
日期:——
An efficient step-economical tandem approach for the direct synthesis of pyrido fused indole, quinoline, benzofuran and benzothiophene derivatives using a bimetallic Pd/Cu catalytic system has been described. The three component reaction of o-halo aldehydes, alkynes and tert-butylamine leads to the synthesis of biologically active polyheterocycles. The present strategy involves the dual role of tert-butylamine
Flexible Synthesis of Fused Benzofuran Derivatives by Rhodium-Catalyzed [2 + 2 + 2] Cycloaddition with Phenol-Linked 1,6-Diynes
作者:Yoshiyuki Komine、Akiyoshi Kamisawa、Ken Tanaka
DOI:10.1021/ol900802d
日期:2009.6.4
A flexible and convenient synthesis of fused benzofuran derivatives has been achieved under mild reaction conditions by cationic rhodium(I)/H8−BINAP complex-catalyzed [2 + 2 + 2] cycloadditions of phenol-linked 1,6-diynes with alkynes and nitriles.
在温和的反应条件下,通过阳离子铑(I)/ H 8 -BINAP络合物催化苯并连接的1,6-二炔与炔烃的[2 + 2 + 2]环加成反应,可以灵活,方便地合成稠合的苯并呋喃衍生物。腈。
METAL COMPLEX COMPRISING NOVEL LIGAND STRUCTURES
申请人:Rayabarapu Dinesh
公开号:US20120061654A1
公开(公告)日:2012-03-15
Compounds comprising a metal complex having novel ligands are provided. In particular, the compound is an iridium complex comprising novel aza DBX ligands. The compounds may be used in organic light emitting devices, particularly as emitting dopants, providing improved efficiency, low operating voltage, and long lifetime.
The present invention relates to metal complexes and to electronic devices, in particular organic electroluminescent devices, comprising these metal complexes.
本发明涉及金属配合物以及包括这些金属配合物的电子设备,特别是有机电致发光器件。
Organic electroluminescent materials and devices
申请人:Rayabarapu Dinesh
公开号:US09359549B2
公开(公告)日:2016-06-07
Compounds comprising a metal complex having novel ligands are provided. In particular, the compound is an iridium complex comprising novel aza DBX ligands. The compounds may be used in organic light emitting devices, particularly as emitting dopants, providing improved efficiency, low operating voltage, and long lifetime.