Acetic Acid → 6-((4-(Prop-2-yn-1-yloxy)benzyl)amino)hexanoic acid

HRID 1422506Notes

Reaction equation

[NH2:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][C:7]([OH:9])=[O:8].[CH2:10]([O:13][C:14]1[CH:21]=[CH:20][C:17]([CH:18]=O)=[CH:16][CH:15]=1)[C:11]#[CH:12].C(O)(=O)C.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>ClCCCl.O>[CH2:10]([O:13][C:14]1[CH:15]=[CH:16][C:17]([CH2:18][NH:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][C:7]([OH:9])=[O:8])=[CH:20][CH:21]=1)[C:11]#[CH:12]

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of 6-aminohexanoic acid (2.62 g, 20 mmol), 4-(prop-2-yn-1-yloxy)benzaldehyde (0.80 g, 5.0 mmol) and acetic acid (0.50 mL) in DCE (50 mL) was heated at 80° C. for 60 min. The reaction mixture was cooled to 0° C., and treated with NaBH(OAc)3 (2.11 g, 10 mmol). The reaction was stirred at room temperature for 12 hours and decomposed with water and then extracted with DCM. The organic layer was dried and concentrated under reduced pressure to give a residue, which was purified using a Biotage SP4 and gradient elution of 5-50% methanol in DCM. The yield of the target compound 644-(prop-2-yn-1-yloxy)benzyl)amino)hexanoic acid was 62% (0.856 g). 1H NMR (400 MHz, DMSO-d6): δ 7.19 (d, J=8.4 Hz, 2H), 6.86 (d, J=8.4 Hz, 2H), 4.71 (s, 2H), 3.56 (s, 2H), 3.49 (s, 1H), 2.39 (t, J=7.0 Hz, 2H), 2.00 (t, J=7.2 Hz, 2H), 1.41-1.19 (m, 6H); MS (ESI), 276.1 (M+H)+.

Workup

extractionextracted with DCM
customThe organic layer was dried
concentrationconcentrated under reduced pressure
customto give a residue, which
customwas purified
washa Biotage SP4 and gradient elution of 5-50% methanol in DCM

Sources & evidence

ORD record: ord-95a9e0170753421fa1937b576446c3b9
Source dataset: uspto-grants-2015_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08926944B2

Reaction notes

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