Tetrahydrofuran → (+/-)-2-tert-butyl-4-chloro-5-(4-(1-hydroxy-but-2-oxy)benzyl)oxy-3(2H)-pyridazinone

HRID 1516046Notes

Reaction equation

HRID 1516046 reaction equation
[C:1]([N:5]1[C:10](=[O:11])[C:9]([Cl:12])=[C:8]([O:13][CH2:14][C:15]2[CH:20]=[CH:19][C:18]([O:21][CH:22]([CH2:28][CH2:29]O[SiH](C)C)[CH2:23]C(C)(C)C)=[CH:17][CH:16]=2)[CH:7]=[N:6]1)([CH3:4])([CH3:3])[CH3:2].[F-].C([N+](CCCC)(CCCC)CCCC)CCC.[O:52]1CCCC1>>[C:1]([N:5]1[C:10](=[O:11])[C:9]([Cl:12])=[C:8]([O:13][CH2:14][C:15]2[CH:16]=[CH:17][C:18]([O:21][CH:22]([CH2:28][CH3:29])[CH2:23][OH:52])=[CH:19][CH:20]=2)[CH:7]=[N:6]1)([CH3:4])([CH3:2])[CH3:3]

Participants

4

Reactant 3

HCID 8028TetrahydrofuranHCID 2724141Tetrabutylammonium FluorideHCID 131726806(+/-)-2-tert-butyl 4-chloro 5-(4-(1-tertbutyldimethylsilyloxy but-2-oxy)benzyl)oxy 3(2H)-pyridazinone

Product 1

HCID 59678644(+/-)-2-tert-butyl-4-chloro-5-(4-(1-hydroxy-but-2-oxy)benzyl)oxy-3(2H)-pyridazinoneYield 80%

Procedure

To the product of Example 3D (0.3 g, 0.6 mmol) in a 10 mL round bottom flask was added tetrahydrofuran (2 mL). Upon solution, tetrabutylammonium fluoride (1.8 mmol, 1.8 mL, 1 M solution in THF) was added and the reaction mixture was stirred for 90 minutes. The contents were then concentrated under reduced pressure and the crude mixture purified by flash chromatography using silica gel (hexanes:ethyl acetate) to obtain 185 mg (80%) of pure desired product. 1H (CDCl3) δ (ppm): 7.74 (s, 1H), 7.3 (d, 2H), 6.9 (d, 2H), 5.2 (s, 2H), 4.3 (m, 1H), 3.81-3.77 (two br s, 2H), 1.84 (hr t, 1H), 1.77-1.69 (m, 2H), 1.64 (s, 9H), 0.98 (t, 3H); 13C (CDCl3) δ (ppm): 159.2, 158.9, 153.9, 129.2, 127.5, 125.4, 116.6, 80.4, 71.9, 66.5, 64.2, 28, 23.5, 9.7.

Workup

  1. concentrationThe contents were then concentrated under reduced pressure
  2. customthe crude mixture purified by flash chromatography

Sources & evidence

ORD record
ord-40f13b012ecc46a286c0bb6a45cd52d6
Source dataset
uspto-grants-2012_07
Patent number
US08226929B2

Reaction notes

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