Phenylphosphinic acid is found to catalyze the three-component condensation of an aldehyde, enaminone, and urea or thiourea to afford the corresponding 6-unsubstituted dihydropyrimidinones in high to excellent yields. This methodology is simple and fast synthetic route for the preparation of interesting class of heterocycles.
Chemo-/regioselective synthesis of 6-unsubstituted dihydropyrimidinones, 1,3-thiazines and chromones via novel variants of Biginelli reaction
作者:Jie-Ping Wan、Yuan-Jiang Pan
DOI:10.1039/b901112a
日期:——
A novel and facile cascade Biginelli-like assembly employing enaminone, aldehyde and urea/thiourea has been developed, which provides a highly chemo- and regioselective synthesis of new dihydropyrimidinones, 1,3-thiazines and chromones by altering particular functional groups in the reactants.
A green approach for the multicomponent synthesis of polyhydroquinolines and 6-unsubstituted dihydropyrimidinones using novel highly proficient acidic ionic liquid [CEMIM][MSA] as a reusable catalyst
作者:Priyanka Patil、Suresh Kadam、Dayanand Patil、Paresh More
DOI:10.1016/j.catcom.2022.106500
日期:2022.10
Carboxylic acid functionalized imidazolium based novel acidicionicliquid [CEMIM][MSA] was synthesized using economically feasible raw materials under very mild condition. The cost effective and sustainable synthesis of polyhydroquinoline and 6-unsustituted dihydropyrimidinone derivatives in green media was first time carried out very effectively using [CEMIM][MSA] catalyst. Acidicionicliquid catalyst
Dihydropyrimidones and pharmaceutical compositions thereof
申请人:King Abdulaziz University
公开号:US10358425B1
公开(公告)日:2019-07-23
A series of heterocyclic compounds containing a dihydropyrimidone or dihydropyrimidinthione functionality. Pharmaceutical compositions containing the compounds and methods of producing the compounds via ultrasonication are also provided.
AbstractThe three‐component Biginelli‐like cyclocondensation reaction of enamines 1, urea, and aldehydes in dioxane/acetic acid efficiently afforded the corresponding 6‐unsubstituted 3,4‐dihydropyrimidin‐2(1H)‐ones 2 in good yields (Scheme 1, Table). The corresponding reaction of azaenamine (=hydrazone) 7 with benzaldehyde and urea afforded 6‐acetyl‐1,2,4‐triazin‐3(2H)‐ones in good yields (Scheme 3).