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Synthesis and biological evaluation of 8-aryl-2-morpholino-7-O-substituted benzo[e][1,3]oxazin-4-ones against DNA-PK, PI3K, PDE3A enzymes and platelet aggregation.

Abstract：

:A series of 40 7-(O-substituted)-2-morpholino-8-aryl-4H-benzo[e][1,3]oxazin-4-one derivatives was synthesized. They were prepared via synthesis of a key precursor, 8-bromo-7-hydroxy-2-morpholino-4H-benzo[e][1,3]oxazin-4-one 13 which was amenable to ether synthesis at the 7-position and Suzuki coupling at the 8-position. The 2 protons of 7-OCH2 in compounds 18g, 18h, 18i, 18l and 18m prove to be magnetically non-equivalent, atropisomerism (axial chirality), as result of sterically hindered rotation of the bulky 8-aryl-substituent. The products were evaluated for their activities against PI3K isoforms, DNA-PK and PDE3. The results showed that this substitution pattern has a deleterious effect on PI3K activities, which may arise from steric hindrance in the active site. PI3Kδ was somewhat more tolerant of this substitution particularly where 8-(4-methoxylphenyl) substituents were present (IC50s∼2-3μM). Good activities against PDE3 were also obtained for compounds, with particular members of the 7-(2-pyridinyl) methoxy series 19 showing good inhibition (IC50s∼2-3μM), comparable to previously described analogues. A piperazinyl derivative 26a effectively inhibited ADP-induced platelet aggregation with an IC50 of 8μM.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Saifuzzaman M,Morrison R,Zheng Z,Orive S,Hamilton J,Thompson PE,Al-Rawi JMA

doi

10.1016/j.bmc.2017.08.022

subject

Has Abstract

pub_date

2017-10-15 00:00:00

pages

5531-5536

issue

20

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(17)31198-7

journal_volume

25

pub_type

杂志文章

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