Guanidine Hydrochloride → Methyl 2-amino-6,7-dihydro-5H-cyclopenta[d]pyrimidine-6-carboxylate

HRID 2175902Notes

Reaction equation

CN([CH:4]=[C:5]1[C:9](=O)[CH2:8][CH:7]([C:11]([O:13][CH3:14])=[O:12])[CH2:6]1)C.Cl.[NH2:16][C:17]([NH2:19])=[NH:18].C[O-].[Na+]>CO>[NH2:18][C:17]1[N:19]=[CH:4][C:5]2[CH2:6][CH:7]([C:11]([O:13][CH3:14])=[O:12])[CH2:8][C:9]=2[N:16]=1

Participants

Conditions

Temperature: 90 °C

Procedure

To a solution of methyl 3-[(dimethylamino)methylidene]-4-oxocyclopentanecarboxylate (71.7 mg, 0.36 mmol) in anhydrous methanol (2.5 mL) was added guanidine hydrochloride (124.7 mg, 1.3 mmol) followed by sodium methoxide in methanol (0.24 mL, 1.27 mmol). The mixture was heated to 90° C. in a sealed tube overnight. The crude reaction was quenched with 2 N HCl and concentrated in vacuo. The aqueous residue was purified by HPLC (30×100 mm Waters Sunfire column; 5 micron; 35 mL/min.; 210 nM; 0% to 40% CH3CN+0.05% TFA/water+0.05% TFA over 15 min.; the compound eluted at 10% CH3CN+0.05% TFA/water+0.05% TFA) to afford the title compound after lyophilization.

Workup

customThe crude reaction
customwas quenched with 2 N HCl
concentrationconcentrated in vacuo
customThe aqueous residue was purified by HPLC (30×100 mm Waters Sunfire column
washthe compound eluted at 10% CH3CN+0.05% TFA/water+0.05% TFA)

Sources & evidence

ORD record: ord-dee21f97baec43fe97cf9bd7ab342a77
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09062070B2

Reaction notes

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