Triphenylphosphine → 2-[3-((S)-2-Benzyloxy-1-methyl-ethoxy)-phenyl]-5-tert-butyl-2H-pyrazol-3-ylamine

HRID 2282725Notes

Reaction equation

HRID 2282725 reaction equation
[NH2:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=2O)[N:5]=[C:4]([C:14]([CH3:17])([CH3:16])[CH3:15])[CH:3]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH2:37]([O:44][CH2:45][C@H:46]([OH:48])[CH3:47])[C:38]1[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1.O>[CH2:37]([O:44][CH2:45][C@H:46]([CH3:47])[O:48][C:9]1[CH:8]=[C:7]([N:6]2[C:2]([NH2:1])=[CH:3][C:4]([C:14]([CH3:17])([CH3:16])[CH3:15])=[N:5]2)[CH:12]=[CH:11][CH:10]=1)[C:38]1[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=1

Participants

7

Reactant 4

HCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 10953891(2R)-1-(benzyloxy)propan-2-olHCID 587052255-Amino-3-tert-butyl-pyrazol-1-yl-phenol

Product 1

HCID 866872782-[3-((S)-2-Benzyloxy-1-methyl-ethoxy)-phenyl]-5-tert-butyl-2H-pyrazol-3-ylamineYield 48%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

A mixture of Intermediate 95a (0.50 g, 2.2 mmol) in dry THF (17 mL) was treated with triphenylphosphine (1.13 g, 4.32 mmol) and (R)-(−)-1-benzyloxy-2-propanol (0.52 mL, 3.24 mmol) then diisopropylazodicarboxylate (0.85 mL, 4.32 mmol) was added dropwise (the reaction mixture became very warm). After stirring at ambient temperature for 1.75 h the mixture was treated with water (0.2 mL) then concentrated in vacuo to a viscous orange oil. The oil was purified by FCC, using 0-7% EtOAc in DCM. The resulting oil was purified further by FCC, using 0-30% EtOAc in cyclohexane. The product was applied to a pre-conditioned (with MeOH)SCX-2 cartridge and eluted with MeOH then 2N NH3 in MeOH. The product containing fractions were combined and concentrated in vacuo to give the title compound as a viscous golden oil (0.39 g, 48%). LCMS (Method 3): Rt 3.77 min, m/z 380.4 [MH+].

Workup

  1. temperaturebecame very warm)
  2. concentrationthen concentrated in vacuo to a viscous orange oil
  3. customThe oil was purified by FCC
  4. customThe resulting oil was purified further by FCC
  5. washeluted with MeOH
  6. additionThe product containing fractions
  7. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-7c651807b13a423a815e2e9c52446ebf
Source dataset
uspto-grants-2015_09
Patent number
US09139584B2

Reaction notes

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