Rhodium-Catalyzed Asymmetric N−H Functionalization of Quinazolinones with Allenes and Allylic Carbonates: The First Enantioselective Formal Total Synthesis of (−)-Chaetominine
作者:Yirong Zhou、Bernhard Breit
DOI:10.1002/chem.201705059
日期:2017.12.22
An unprecedented asymmetric N−H functionalization of quinazolinones with allenes and allylic carbonates was successfully achieved by rhodium catalysis with the assistance of chiral bidentate diphosphine ligands. The high efficiency and practicality of this method was demonstrated by a low catalyst loading of 1 mol % as well as excellent chemo‐, regio‐, and enantioselectivities with broad functional
Peroxide-Mediated Oxidative Radical Cyclization to the Quinazolinone System: Efficient Syntheses of Deoxyvasicinone, Mackinazolinone and (±)-Leucomidine C
作者:Luis D. Miranda、Jazmín García-Ramírez
DOI:10.1055/s-0040-1705975
日期:2021.4
An efficient protocol for obtaining fused quinazolinones through an oxidative free-radical cyclization under metal- and tin-free conditions is described. The oxidativecyclization of various N-3-ω-iodoalkyl derivatives to provide tricyclic systems using dicumyl peroxide as the sole reagent is studied. The method then is employed for the syntheses of 5-, 6-, and 7-membered fused quinazolinone analogues
Disclosed are compounds of Formula I, and pharmaceutically acceptable salts thereof:
Also disclosed are pharmaceutical compositions thereof as well as methods for using the compounds in treating a variety of diseases such as, for example, autoimmune diseases, dry eye syndrome, fibrosis, scar formation, angiogenesis, ischemic damage, inflammatory diseases, cancers, musculoskeletal diseases, cardiovascular diseases, transplant rejection, multiple sclerosis, systemic sclerosis and neurodegenerative diseases.
Photocatalytic cyclization of 3-(2-isocyanophenyl)quinazolin-4(3<i>H</i>)-ones for the construction of quinoxalino[2,1-<i>b</i>]quinazolinones
作者:Xian Wu、Lingli Liu、Chengli Xiang、Jin-Tao Yu、Changduo Pan
DOI:10.1039/d4cc00187g
日期:——
3-(2-Isocyanophenyl)quinazolin-4(3H)-ones were designed and synthesized as new building units for the construction of novel quinoxalino[2,1-b]quinazolinones under mild, photocatalytic and metal-free conditions.
Photoredox streamlines electrocatalysis: photoelectrosynthesis of polycyclic pyrimidin-4-ones through carbocyclization of unactivated alkenes with malonates
base hybrid system for the synthesis of polycyclic pyrimidin-4-ones through dehydrogenative carbocyclization of unactivated alkenes with simple malonates under very mild and external-oxidant-free conditions. The reaction exhibits a good functional-group tolerance and is amenable for a gram-scale synthesis, and the sunlight could serve as the light source. Mechanistic studies suggest that the synergistic