3-Oxo-azetidine-1-carboxylic acid tert-butyl ester → Tert-butyl 3-(cyclopropyl(methyl)amino)azetidine-1-carboxylate

HRID 526449Notes

Reaction equation

O=[C:2]1[CH2:5][N:4]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])[CH2:3]1.Cl.[CH3:14][NH:15][CH:16]1[CH2:18][CH2:17]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(Cl)Cl.C(OCC)(=O)C>[CH:16]1([N:15]([CH3:14])[CH:2]2[CH2:5][N:4]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])[CH2:3]2)[CH2:18][CH2:17]1

Participants

Conditions

Temperature: 20 °C

Procedure

Combined a solution of tert-butyl 3-oxoazetidine-1-carboxylate (175 mg, 1.022 mmol) and N-methylcyclopropanamine hydrochloride (121 mg, 1.124 mmol) in methylene chloride (5 mL) and added sodium triacetoxyborohydride (325 mg, 1.533 mmol) and the solution stirred at 20° C. for 30 min. The solution was concentrated in vacuo to give white solid which was taken up in ethyl acetate (50 mL), washed with saturated sodium bicarbonate (50 mL) and brine, dried with magnesium sulfate and concentrated in vacuo, and then purified on a 40 g silica gel column eluted with 0 to 50% ethyl acetate in hexanes to give the title compound (128 mg, 0.566 mmol, 55.3%) as a clear, colorless oil. MS: 227 (M+H). 1H NMR (400 MHz, METHANOL-d4) δ ppm 0.41-0.47 (m, 2H) 0.48-0.56 (m, 2H) 1.43 (s, 9H) 1.64 (tt, J=6.7, 3.9 Hz, 1H) 2.28 (s, 3H) 3.50 (tt, J=7.5, 5.7 Hz, 1H) 3.84-4.01 (m, 4H).

Workup

concentrationThe solution was concentrated in vacuo
customto give white solid which
washwashed with saturated sodium bicarbonate (50 mL) and brine
dry with materialdried with magnesium sulfate
concentrationconcentrated in vacuo
custompurified on a 40 g silica gel column
washeluted with 0 to 50% ethyl acetate in hexanes

Sources & evidence

ORD record: ord-b98acfe955ea456681fbed935855a047
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09345713B2

Reaction notes

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