4-Substituted-7-N-alkyl-N-acetyl 2-aminobenzothiazole amides: drug-like and non-xanthine based A2B adenosine receptor antagonists.

Authors: Cheung AW, Brinkman J, Firooznia F, Flohr A, Grimsby J, Gubler ML, Guertin K, Hamid R, Marcopulos N, Norcross RD, Qi L, Ramsey G, Tan J, Wen Y, Sarabu R.
Publisher/Year: Bioorg Med Chem Lett. 2010 Jul 15;20(14):4140-6. Epub 2010 May 20.
Pub Med ID/Journal ID: PMID:20541935


7-N-Acetamide-4-methoxy-2-aminobenzothiazole 4-fluorobenzamide (compound 1) was chosen as a drug-like and non-xanthine based starting point for the discovery of A(2B) receptor antagonists because of its slight selectivity against A(1) and A(2A) receptors and modest A(2B) potency. SAR exploration of compound 1 described herein included modifications to the 7-N-acetamide group, substitution of the 4-methoxy group by halogens as well as replacement of the p-flouro-benzamide side chain. This work culminated in the identification of compound 37 with excellent A(2B) potency, modest selectivity versus A(2A) and A(1) receptors, and good rodent PK properties. 2010 Elsevier Ltd. All rights reserved.