N-bromobutanimide → 7-bromo-3-(4-methoxybenzyl)-9-pentyl-6,9-dihydro-5H-[1,2,4]triazolo[4,3-a]purin-5-one

HRID 1664544Notes

Reaction equation

[CH3:1][O:2][C:3]1[CH:27]=[CH:26][C:6]([CH2:7][C:8]2[N:12]3[C:13](=[O:25])[C:14]4[NH:15][CH:16]=[N:17][C:18]=4[N:19]([CH2:20][CH2:21][CH2:22][CH2:23][CH3:24])[C:11]3=[N:10][N:9]=2)=[CH:5][CH:4]=1.[Br:28]N1C(=O)CCC1=O>C1COCC1>[Br:28][C:16]1[NH:15][C:14]2[C:13](=[O:25])[N:12]3[C:8]([CH2:7][C:6]4[CH:5]=[CH:4][C:3]([O:2][CH3:1])=[CH:27][CH:26]=4)=[N:9][N:10]=[C:11]3[N:19]([CH2:20][CH2:21][CH2:22][CH2:23][CH3:24])[C:18]=2[N:17]=1

Participants

Conditions

Temperature: 70 °C

Procedure

To the solution of 3-(4-methoxybenzyl)-9-pentyl-6,9-dihydro-5H-[1,2,4]triazolo[4,3-a]purin-5-one (0.40 g, 1.1 mmol) in THF was added N-Bromosuccinimide (0.29 g, 1.6 mmol). The mixture was stirred at 70° C. for 1 hour. The mixture was concentrated and purified by preparative LCMS to yield the desired product (290 mg, 60%). 1HNMR (300 MHz, d6-DMSO): δ 7.16 (d, J=8.3 Hz, 2H), 6.81 (d, J=8.3 Hz, 2H), 4.46 (s, 3H), 4.20 (t, J=7.2 Hz, 2H), 3.67 (s, 2H), 1.79 (m, 2H), 1.28 (m, 4H), 0.83 (m, 3H). LCMS calculated for C19H21BrN6O2 (M+H): 445.1. found: 445.0, 447.0.

Workup

concentrationThe mixture was concentrated
custompurified by preparative LCMS

Sources & evidence

ORD record: ord-2331582cc30d49ada73f25a3ae93c15a
Source dataset: uspto-grants-2011_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08039478B2

Reaction notes

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