Acetic Anhydride → HCID 69309264, compound

HRID 2250626Notes

Reaction equation

HRID 2250626 reaction equation
[NH2:1][CH2:2][C:3]1[C:4]([CH2:21][CH2:22][CH2:23][CH2:24][C:25]([O:27][CH2:28][CH3:29])=[O:26])=[C:5]([C:14]2[CH:15]=[N:16][CH:17]=[C:18]([CH3:20])[CH:19]=2)[C:6]2[N:7]([C:9]([CH2:12][CH3:13])=[CH:10][CH:11]=2)[N:8]=1.[C:30](OC(=O)C)(=[O:32])[CH3:31]>ClCCl.C(Cl)(Cl)Cl>[C:30]([NH:1][CH2:2][C:3]1[C:4]([CH2:21][CH2:22][CH2:23][CH2:24][C:25]([O:27][CH2:28][CH3:29])=[O:26])=[C:5]([C:14]2[CH:15]=[N:16][CH:17]=[C:18]([CH3:20])[CH:19]=2)[C:6]2[N:7]([C:9]([CH2:12][CH3:13])=[CH:10][CH:11]=2)[N:8]=1)(=[O:32])[CH3:31]

Participants

5

Reactant 2

HCID 7918Acetic AnhydrideHCID 69311575HCID 69311575, compound

Product 1

HCID 69309264HCID 69309264, compoundYield 93.6%

Reagents, catalysts & solvents 2

HCID 6212ChloroformSolventHCID 6344DichloromethaneSolvent

Procedure

A mixture of ethyl 5-[2-(aminomethyl)-7-ethyl-4-(5-methyl-3-pyridinyl)pyrrolo[1,2-b]pyridazin-3-yl]pentanoate (67.6 mg) and acetic anhydride (19.2 mg) in dichloromethane (3 mL) was stirred at ambient temperature for 1 hour. The solution was diluted with chloroform, washed with saturated sodium bicarbonate solution and brine, dried over magnesium sulfate, and evaporated in vacuo. The residue was purified by preparative silica gel column chromatography eluting with a mixture of chloroform and methanol (20:1) to give ethyl 5-[2-[(acetylamino)methyl]-7-ethyl-4-(5-methyl-3-pyridinyl)pyrrolo[1,2-b]pyridazin-3-yl]pentanoate as yellow oil (70 mg).

Workup

  1. washwashed with saturated sodium bicarbonate solution and brine
  2. dry with materialdried over magnesium sulfate
  3. customevaporated in vacuo
  4. customThe residue was purified by preparative silica gel column chromatography
  5. washeluting with a mixture of chloroform and methanol (20:1)

Sources & evidence

ORD record
ord-0025c1d60eb54b78bc99eec247aaf3d6
Source dataset
uspto-grants-2008_01
Patent number
US07317009B2

Reaction notes

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