3-Thiophenecarboxylic acid, ethyl ester → 8-Chloro-3-pentyl-1-{4-[5-(3-thienyl)-1,2,4-oxadiazol-3-yl]butyl}-3,7-dihydro-1H-purine-2,6-dione

HRID 1097695Notes

Reaction equation

[Cl:1][C:2]1[NH:10][C:9]2[C:8](=[O:11])[N:7]([CH2:12][CH2:13][CH2:14][CH2:15]/[C:16](=[N:19]/[H])/[NH:17][OH:18])[C:6](=[O:21])[N:5]([CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])[C:4]=2[N:3]=1.CC[O-].[Na+].[S:31]1[CH:35]=[CH:34][C:33]([C:36](OCC)=O)=[CH:32]1>CCO>[Cl:1][C:2]1[NH:10][C:9]2[C:8](=[O:11])[N:7]([CH2:12][CH2:13][CH2:14][CH2:15][C:16]3[N:19]=[C:36]([C:33]4[CH:34]=[CH:35][S:31][CH:32]=4)[O:18][N:17]=3)[C:6](=[O:21])[N:5]([CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])[C:4]=2[N:3]=1

Participants

Conditions

Temperature: 150 °C

Procedure

A solution of (1Z)-5-(8-chloro-2,6-dioxo-3-pentyl-2,3,6,7-tetrahydro-1H-purin-1-yl)-N-hydroxypentanimidamide (50 mg, 0.13 mmol) in EtOH (1 ml) was treated with a 21% solution of NaOEt in EtOH (55 μl, 0.21 mmol) and ethyl 3-thiophenecarboxylate (18 μl, 0.13 mmol). The mixture was heated in the microwave at 150° C. for 10 min. After cooling, the reaction was partitioned between 2M HCl (aq) and EtOAc. The organic layer was separated and the aqueous extracted again with EtOAc. The combined extracts were concentrated and purified by the MDAP. The title compound was obtained as an off-white solid (20 mg, 32%).

Workup

temperatureAfter cooling
customthe reaction was partitioned between 2M HCl (aq) and EtOAc
customThe organic layer was separated
extractionthe aqueous extracted again with EtOAc
concentrationThe combined extracts were concentrated
custompurified by the MDAP

Sources & evidence

ORD record: ord-79c4f2cb49bf45c89429cd0927aaf578
Source dataset: uspto-grants-2012_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08143264B2

Reaction notes

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