Reaction of 3-(acetoxyamino)quinazolin-4(3H)-ones with enolic β-diketones: the N–N bond as a chiral axis in N-(3,4-dihydro-4-oxoquinazolin-3-yl)-N-acyl-α-aminoketones; reductive and base-catalysed cleavage of the N–N bond in N-acetyl-N-(3,4-dihydro-4-oxoquinazolin-3-yl)-α-amino acid esters
摘要:
Following the method of Foucaud and coworkers, reaction of pentane-2,4-dione with 3-(acetoxy-amino)quinazolin-4-one 8 gave the keto amide 9 (15%). 3-Methylpentane-2,4-dione reacts with compound 8 to give a relatively stable enol 11 (66%) which can be isolated in a crystalline form. Rotation around the N-N bonds in both compounds 9 and 11 is believed to be slow on the real time-scale and hence the N-N bonds can be considered as a chiral axes. As a result, protonation of the enol double bond in compound 11 and the creation of an additional chiral centre, gives rise to the separable keto amides 14 and 15; this protonation can be accomplished completely diastereoselectively. Lead tetraacetate acetoxylation of compound 11 to give compound 19 is also completely diastereoselective, Brief heating of the enol effects the elimination of the quinazolinone and the formation of the N-acetylimine 16 via an 8-membered transition state. Base-catalysed elimination of the quinazolinone ring from compound 22 is surprisingly easy: reductive cleavage of this N-N bond in compound 22 is facile by comparison with the 3-(alkylamino)quinazolin-4-ones.
A medicament having an inhibitory activity against hematopoietic prostaglandin D2 synthase, which comprises as an active ingredient a compound represented by the following general formula (I) or a salt thereof:
wherein X represents a group represented by the formula —N═C(R
5
)— or the formula —NH—CH(R
5
)—, R
1
, R
2
, R
3
, and R
4
represent a hydrogen atom, a halogen atom, a C
1
to C
6
alkyl group, or a hydroxy group, R
5
represents a C
1
to C
6
alkyl group or a C
6
to C
10
aryl group, and R represents an amino group.
Synthesis, biological evaluation, and in silico study of novel library sulfonates containing quinazolin‐4(<scp>3<i>H</i></scp>)‐one derivatives as potential aldose reductase inhibitors
作者:Feyzi Sinan Tokalı、Yeliz Demir、İbrahim Hakkı Demircioğlu、Cüneyt Türkeş、Erbay Kalay、Kıvılcım Şendil、Şükrü Beydemir
DOI:10.1002/ddr.21887
日期:——
A series of novel sulfonates containing quinazolin-4(3H)-one ring derivatives was designed to inhibit aldose reductase (ALR2, EC 1.1.1.21). Novel quinazolinone derivatives (1–21) were synthesized from the reaction of sulfonated aldehydes with 3-amino-2-alkylquinazolin-4(3H)-ones in glacial acetic acid with good yields (85%–94%). The structures of the novel molecules were characterized using IR, 1H-NMR
Fragment‐based drug discovery has gained a foothold in today's lead identification processes. We present the application of in silico fragment‐based screening for the discovery of novel lead compounds for the metalloendoproteinase thermolysin. We have chosen thermolysin to validate our screening approach as it is a well‐studied enzyme and serves as a model system for other proteases. A protein‐targeted
[EN] PRMT5 INHIBITOR COMPOUNDS<br/>[FR] COMPOSÉS INHIBITEURS DE LA PRMT5
申请人:UNIV FLORIDA
公开号:WO2020205660A1
公开(公告)日:2020-10-08
A series of PRMT5 inhibitor compounds are described. The compounds are useful as PRMT5 inhibitor compounds and in the treatment of PRMT5 mediated diseases, disorders, and symptoms thereof.
A class of pyrazole derivatives is described for use in treating p38 kinase medicated disorders. Compounds of particular interest are defined by Formula IA
wherein R
1
, R
2
, R
3
and R
4
are as described in the specification.