4-(4,4-Dimethoxybutyl)-5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester → 5-Oxo-4-(4-oxobutyl)-[1,4]diazepane-1-carboxylic acid tert-butyl ester

HRID 2301388Notes

Reaction equation

HRID 2301388 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:14][CH2:13][C:12](=[O:15])[N:11]([CH2:16][CH2:17][CH2:18][CH:19](OC)[O:20]C)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]>C(O)(=O)C>[C:1]([O:5][C:6]([N:8]1[CH2:14][CH2:13][C:12](=[O:15])[N:11]([CH2:16][CH2:17][CH2:18][CH:19]=[O:20])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

3

Reactant 1

HCID 692244834-(4,4-Dimethoxybutyl)-5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester

Product 1

HCID 113121495-Oxo-4-(4-oxobutyl)-[1,4]diazepane-1-carboxylic acid tert-butyl esterYield 32.9%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A solution of 4-(4,4-dimethoxybutyl)-5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester (3 g, 9.08 mmole) in glacial acetic acid containing 0.5 mL water (10 mL) was stirred at room temperature for 24 hours. The solution was concentrated at 35° C. under reduced pressure, and the residue was partitioned between saturated aqueous sodium bicarbonate and diethyl ether. The organic phase was dried (magnesium sulfate), concentrated, and the residue recrystallized from diethyl ether/hexane to give 5-oxo-4-(4-oxobutyl)-[1,4]diazepane-1-carboxylic acid tert-butyl ester (0.85 g,), m.p. 86-87° C.

Workup

  1. concentrationThe solution was concentrated at 35° C. under reduced pressure
  2. customthe residue was partitioned between saturated aqueous sodium bicarbonate and diethyl ether
  3. dry with materialThe organic phase was dried (magnesium sulfate)
  4. concentrationconcentrated
  5. customthe residue recrystallized from diethyl ether/hexane

Sources & evidence

ORD record
ord-e37a9908e6b3455db32de599f81edd79
Source dataset
uspto-grants-2002_12
Patent number
US06500822B2

Reaction notes

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