Triethylamine → (1R,3S,5R)-tert-butyl 3-(5-((trimethylsilyl)ethynyl)-1H-imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylate

HRID 625617Notes

Reaction equation

HRID 625617 reaction equation
I[C:2]1[NH:6][C:5]([C@@H:7]2[CH2:12][C@@H:11]3[C@@H:9]([CH2:10]3)[N:8]2[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])=[N:4][CH:3]=1.C(N(CC)CC)C.[C:27]([Si:29]([CH3:32])([CH3:31])[CH3:30])#[CH:28]>CN(C=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:30][Si:29]([C:27]#[C:28][C:2]1[NH:6][C:5]([C@@H:7]2[CH2:12][C@@H:11]3[C@@H:9]([CH2:10]3)[N:8]2[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])=[N:4][CH:3]=1)([CH3:32])[CH3:31]

Participants

6

Reactant 3

HCID 8471TriethylamineHCID 66111TrimethylsilylacetyleneHCID 58498724(1R,3S,5R)-tert-butyl 3-(4-iodo-1H-imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylate

Product 1

HCID 58498793(1R,3S,5R)-tert-butyl 3-(5-((trimethylsilyl)ethynyl)-1H-imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylateYield 64.5%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolvent

Procedure

Nitrogen was bubbled through a solution of (1R,3S,5R)-tert-butyl 3-(5-iodo-1H-imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylate (1.65 g, 4.40 mmol) and Cu(I)I (168 mg, 0.880 mmol) in triethylamine (3.07 mL, 22.0 mmol) and DMF (40 mL) for 20 min. Then, ethynyltrimethylsilane (2.16 g, 22.0 mmol) and Pd(PPh3)4 (254 mg, 0.220 mmol) were added, the reaction was flushed with nitrogen, sealed and stirred at rt for 24 h. The reaction was concentrated to a brown oil, and purified by BIOTAGE® Horizon (160 g SiO2, 20-40% EtOAc/hexanes) to yield (1R,3S,5R)-tert-butyl 3-(5-((trimethylsilyl)ethynyl)-1H-imidazol-2-yl)-2-azabicyclo[3.1.0]hexane-2-carboxylate (980 mg) as a yellow solid. LC-MS retention time 3.230 min; m/z 346.17 (MH+). LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a PHENOMENEX® Luna 3u C18 2.0×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 0.8 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 4 min, a hold time of 1 min, and an analysis time of 5 min where Solvent A was 10% MeOH/90% H2O/0.1% trifluoroacetic acid and Solvent B was 10% H2O/90% MeOH/0.1% trifluoroacetic acid. MS data was determined using a MICROMASS® Platform for LC in electrospray mode. 1H NMR (400 MHz, chloroform-d) δ ppm 7.18 (s, 1H), 4.77 (dd, J=9.2, 5.1 Hz, 1H), 3.20 (br. s., 1H), 3.14-3.39 (m, 1H), 2.33 (dd, J=13.2, 9.4 Hz, 1H), 1.69-1.78 (m, 1H), 1.34-1.56 (m, 1H), 1.49 (s, 9H), 0.85 (dt, J=8.5, 5.7 Hz, 1H), 0.41-0.47 (m, 1H), 0.22-0.24 (m, 9H).

Workup

  1. customthe reaction was flushed with nitrogen
  2. customsealed
  3. concentrationThe reaction was concentrated to a brown oil
  4. custompurified by BIOTAGE® Horizon (160 g SiO2, 20-40% EtOAc/hexanes)

Sources & evidence

ORD record
ord-f6d1d2da2f3544a3939bb9cb847fa97e
Source dataset
uspto-grants-2016_04
Patent number
US09303007B2

Reaction notes

Loading…