3-Amino-3-methylbutanoic acid → HCID 71736591, compound

HRID 1481186Notes

Reaction equation

C(O[C:4]([C:6]1[N:7]=[C:8]([C:25]#[N:26])[C:9]2[C:14]([C:15]=1[OH:16])=[CH:13][CH:12]=[C:11]([O:17][CH2:18][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[CH:10]=2)=[O:5])C.[NH2:27][C:28]([CH3:34])([CH3:33])[CH2:29][C:30]([OH:32])=[O:31].C[O-].[Na+]>CN(C=O)C.O>[CH2:18]([O:17][C:11]1[CH:10]=[C:9]2[C:14]([C:15]([OH:16])=[C:6]([C:4]([NH:27][C:28]([CH3:34])([CH3:33])[CH2:29][C:30]([OH:32])=[O:31])=[O:5])[N:7]=[C:8]2[C:25]#[N:26])=[CH:13][CH:12]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1

Participants

Conditions

Temperature: 140 °C

Procedure

7-Benzyloxy-1-cyano-4-hydroxy-isoquinoline-3-carboxylic acid ethyl ester (US Patent Publication No. 2007/627906) (40 mg, 0.115 mmol) was dissolved in anhydrous DMF (2 mL). 3-Amino-3-methyl-butyric acid (68 mg, 0.5742 mmol) and solid sodium methoxide (25 mg, 0.459 mmol) were added sequentially and the mixture heated to 140° C. in an oil bath for 3.5 h. Upon completion, the reaction mixture was cooled and diluted with water. The solution was acidified to pH 3 with 1M hydrochloric acid inducing precipitation of the product. The free acid was isolated by filtration and dried to provide the title compound as a tan solid in 92% yield. MS ESI(−) m/e: 417.9596 (M−1), MS ESI(+) m/e: 419.9934 (M+1).

Workup

temperatureUpon completion, the reaction mixture was cooled
customThe solution was acidified to pH 3 with 1M hydrochloric acid inducing precipitation of the product
customThe free acid was isolated by filtration
customdried

Sources & evidence

ORD record: ord-86b4fd48285d4fb0b19de9712236e137
Source dataset: uspto-grants-2016_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09409892B2

Reaction notes

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