AbstractAn efficient copper‐catalyzed tandem aerobic oxidative annulation and carbon‐carbon bond cleavage reaction was developed from easily accessible arylacetamides, which provides a direct approach for the domino synthesis of a vast array of tricyclic or tetracyclic fused quinazolinone alkaloid structures. A plausible reaction mechanism is proposed involving an aerobic benzylic oxidation/cyclization/decarbonylation cascade.magnified image
Palladium‐Catalyzed Carbonylative Difunctionalization of C=N Bond of Azaarenes or Imines to Quinazolinones
作者:Xibing Zhou、Yongzheng Ding、Hanmin Huang
DOI:10.1002/asia.202000359
日期:2020.6.2
Supporting information for this article is given via a link at the end of the document. By intercepting the acylpalladium species with C=Nbond of azaarenes or imines other than free amines or alcohols, the difunctionalization of C=Nbond was established via palladium‐catalyzed carbonylation/nucleophilic addition sequence. This method is compatible with a diverse range of azaarenes and imines and allows
simple and efficientsynthesis of 11H-pyrido[2,1-b]quinazolin-11-ones by Cu(OAc)2·H2O-catalyzed reaction of easily available substituted isatins and 2-bromopyridine derivatives has been developed. The reaction involves C–N/C–C bond cleavage and two C–N bond formations in a one-pot operation. This methodology is complementary to previously reported synthetic procedures, and two plausible reaction mechanisms
Serendipitous Synthesis of Pyridoquinazolinones <i>via</i> an Oxidative C–C Bond Cleavage
作者:Matthias Brendel、Priyanka R. Sakhare、Gaurav Dahiya、Parthasarathi Subramanian、Krishna P. Kaliappan
DOI:10.1021/acs.joc.0c00982
日期:2020.6.19
A direct one-pot copper-catalyzed oxidative C–C bond cleavage route to the synthesis of pyridoquinazolinones is described. This one-pot strategy involves a copper-catalyzed C–N coupling followed by concomitant C(sp3)–H oxidation and amidation via oxidative C–C bond cleavage under an O2 atmosphere to deliver the target molecules in high yields.
Synthesis of Pyrido[2,1-<i>b</i>]quinazolin-11-ones and Dipyrido[1,2-a:2′,3′-<i>d</i>]pyrimidin-5-ones by Pd/DIBPP-Catalyzed Dearomatizing Carbonylation
作者:Tongyu Xu、Howard Alper
DOI:10.1021/acs.orglett.5b00452
日期:2015.3.20
1-b]quinazolin-11-ones were obtained from N-(2-bromophenyl)pyridine-2-amines in up to quantitative yield and dipyrido[1,2-a:2′,3′-d]pyrimidin-5-ones from 3-bromo-N-(pyridine-2-yl)pyridine-2-amines in up to 84% yield. The cyclocarbonylation can be also realized without isolation of compound 1 and additional palladium catalyst.
通过使用1,3-双(二异丁基膦基)丙烷(DIBPP)作为配体的钯催化的脱芳构羰基化反应,可以轻松合成N杂环。从N-(2-溴苯基)吡啶-2-胺中定量获得吡啶并[2,1- b ]喹唑啉-11-酮和二吡啶并[1,2-a:2',3'- d ]来自3-溴-N-(吡啶-2-基)吡啶-2-胺的嘧啶-5-酮,产率高达84%。也可以在不分离化合物1和另外的钯催化剂的情况下实现环羰基化。