Triphenylphosphine → 2-t-butyl-5-{4-[2-(t-butyldimethylsilanyloxy)ethoxymethyl]benzyloxy}-4-chloro-2H-pyridazin-3-one

HRID 1751830Notes

Reaction equation

HRID 1751830 reaction equation
[Si:1]([O:8][CH2:9][CH2:10][O:11][CH2:12][C:13]1[CH:18]=[CH:17][C:16]([CH2:19][OH:20])=[CH:15][CH:14]=1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[C:21]([N:25]1[C:30](=[O:31])[C:29]([Cl:32])=[C:28](O)[CH:27]=[N:26]1)([CH3:24])([CH3:23])[CH3:22].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O>C1COCC1.O>[C:21]([N:25]1[C:30](=[O:31])[C:29]([Cl:32])=[C:28]([O:20][CH2:19][C:16]2[CH:17]=[CH:18][C:13]([CH2:12][O:11][CH2:10][CH2:9][O:8][Si:1]([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2])=[CH:14][CH:15]=2)[CH:27]=[N:26]1)([CH3:24])([CH3:22])[CH3:23]

Participants

7

Reactant 4

HCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 546869462-tert-Butyl-4-chloro-5-hydroxypyridazin-3(2H)-oneHCID 59678648HCID 59678648, compound

Product 1

HCID 596786292-t-butyl-5-{4-[2-(t-butyldimethylsilanyloxy)ethoxymethyl]benzyloxy}-4-chloro-2H-pyridazin-3-oneYield 89.4%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To solution of the product of Example 5C (437 mg, 1.48 mmol) and 2-tert-butyl-4-chloro-5-hydroxy-2H-pyridazin-3-one (250 mg, 1.23 mmol) dissolved in anhydrous THF (12 mL) was added solid PPh3 (485 mg, 1.85 mmol) and diisopropyl azodicarboxylate (DIAD, 0.358 mL, 1.85 mmol). After completion of addition the reaction mixture continued to stir at room temperature. After 20 hours, the reaction mixture was diluted with water. The aqueous layer was separated and extracted with ethyl acetate (3×). All combined organic layers were dried over Na2SO4, filtered, and concentrated to provide an oil. The crude material was purified using silica gel chromatography (4:1 pentane:ethyl acetate) to provide the desired product 528 mg, 1.10 mmol) in 89% yield. 1H (CDCl3 7.70 (1H, s), 7.38 (4H, m), 5.30 (2H, s), 4.58, 600 MHz): δ (2H, s), 3.80 (2H, t, J=5.4 Hz), 3.57 (2H, t, J=5.4 Hz), 1.63 (9H, br s), 0.90 (9H, s), 0.07 (6H, s); 13C (CDCl3159.0, 153.7, 138.8, 134.4, 128.3, 127.3, 150 MHz): δ 125.1, 118.5, 72.8, 71.7, 71.6, 66.4, 61.9, 29.7, 27.9, 25.6, −5.1.; HRMS calcd for C24H37ClN2O4Si: 481.228389, found 481.2282.

Workup

  1. additionAfter completion of addition the reaction mixture
  2. customThe aqueous layer was separated
  3. extractionextracted with ethyl acetate (3×)
  4. dry with materialAll combined organic layers were dried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customto provide an oil
  8. customThe crude material was purified

Sources & evidence

ORD record
ord-a1eb0d6e030c4284bcde88138123994a
Source dataset
uspto-grants-2015_10
Patent number
US09161997B2

Reaction notes

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