Triethylamine → 3-Methyl-1-(5-nitro-pyridin-2-ylmethyl)azetidin-3-ol

HRID 55889Notes

Reaction equation

[N+:1]([C:4]1[CH:5]=[CH:6][C:7]([CH2:10]OS(C)(=O)=O)=[N:8][CH:9]=1)([O-:3])=[O:2].[CH3:16][C:17]1([OH:21])[CH2:20][NH:19][CH2:18]1.C(N(CC)CC)C>CO.CO.C1COCC1>[CH3:16][C:17]1([OH:21])[CH2:20][N:19]([CH2:10][C:7]2[CH:6]=[CH:5][C:4]([N+:1]([O-:3])=[O:2])=[CH:9][N:8]=2)[CH2:18]1

Participants

Conditions

Temperature: 0 °C

Procedure

To a solution of 52 (0.5 g, 2.2 mmol) in MeOH (25 mL) was added Ambersep-900 OH resin (50 g) filtered to separate the resin and concentrated to obtain the free base. The free base was dissolved in MeOH-THF (10 mL, 1:1) and cooled to 0° C. 3-methyl-azetidin-3-ol (0.53 g, 4.3 mmol) and triethylamine (0.7 mL, 4.3 mmol) were added and the reaction mixture warmed to rt and stirred for 16 h. The reaction mixture was concentrated and the crude compound was purified by silica gel column chromatography (100-200 mesh), eluting with 3% MeOH/CHCl3 to give the desired compound (0.35 g, 48%, over two steps) as a pale yellow liquid. Rf: 0.3 (10% MeOH/DCM); (m/z): 224 [MH]+; 1H NMR (400 MHz, DMSO-d6): δ 9.27 (1H, d, J=2.4 Hz), 8.56 (1H, dd, J=8.8, 2.8 Hz), 7.64 (1H, d, J=8.8 Hz), 5.22 (1H, s), 3.85 (2H, s), 3.36-3.26 (2H, m), 3.02-3.00 (2H, m), 1.38 (3H, s).

Workup

filtrationfiltered
customto separate the resin
concentrationconcentrated
customto obtain the free base
temperaturethe reaction mixture warmed to rt
concentrationThe reaction mixture was concentrated
customthe crude compound was purified by silica gel column chromatography (100-200 mesh)
washeluting with 3% MeOH/CHCl3

Sources & evidence

ORD record: ord-155fd89aab6849cea7b77783367c4e9c
Source dataset: uspto-grants-2016_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09433622B2

Reaction notes

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