Methyl chloroformate → HCID 86759540, compound

HRID 392638Notes

Reaction equation

HRID 392638 reaction equation
Cl[C:2]([O:4][CH3:5])=[O:3].[CH3:6][C:7]1[CH:12]=[CH:11][C:10]([S:13]([O:16][CH2:17][C@@H:18]2[O:23][C:22]3[C:24]([CH:29]=[CH:30][CH3:31])=[C:25]([NH2:28])[CH:26]=[CH:27][C:21]=3[O:20][CH2:19]2)(=[O:15])=[O:14])=[CH:9][CH:8]=1.C(N(CC)C(C)C)(C)C>C(OCC)(=O)C>[CH3:6][C:7]1[CH:12]=[CH:11][C:10]([S:13]([O:16][CH2:17][CH:18]2[O:23][C:22]3[C:24]([CH:29]=[CH:30][CH3:31])=[C:25]([NH:28][C:2]([O:4][CH3:5])=[O:3])[CH:26]=[CH:27][C:21]=3[O:20][CH2:19]2)(=[O:15])=[O:14])=[CH:9][CH:8]=1

Participants

5

Reactant 3

HCID 6586Methyl chloroformateHCID 81531DiisopropylethylamineHCID 86586603HCID 86586603, compound

Product 1

HCID 86759540HCID 86759540, compoundYield 70%

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

Methyl chloroformate (2.93 mL, 37.9 mmole) was added to a solution of {(2R)-7-amino-8-[1-propenyl]-2,3-dihydro-1,4-benzodioxin-2-yl}methyl 4-methyl-benzenesulfonate (2.35 g, 6.30 mmole) in ethyl acetate (125 mL), followed by the addition of N,N-diisopropylethylamine (5.50 mL, 31.6 mmole) dropwise over a period of 20 minutes. The solution was stirred under nitrogen at room temperature over a period of 10 hours. This solution was then washed with 2N aqueous HCl, saturated aqueous sodium bicarbonate and brine and dried over magnesium sulfate. Filtration, evaporation in vacuum and column chromatography on silica gel with 0.2% methanol/methylene chloride gave the (R)-enantiomer of the title compound as a white foam (1.90 g, 70%). 1H (CDCl3) doublet, 7.8 δ (2 H); doublet, 7.3 δ (3 H); doublet, 6.7 δ (1 H); broad singlet, 6.6 δ (1 H); multiplet, 6.1 δ (2 H); multiplet, 4.4 δ (1 H); multiplet 4.2 δ (3 H); multiplet, 4.0 δ (1 H); singlet, 3.7 δ (3 H); singlet, 2.4 δ (3 H); doublet, 1.9 δ (3 H).

Workup

  1. washThis solution was then washed with 2N aqueous HCl, saturated aqueous sodium bicarbonate and brine
  2. dry with materialdried over magnesium sulfate
  3. filtrationFiltration, evaporation in vacuum and column chromatography on silica gel with 0.2% methanol/methylene chloride

Sources & evidence

ORD record
ord-75ae0ff2f0ba498388a32515213829a3
Source dataset
uspto-grants-2004_10
Patent number
US06800648B2

Reaction notes

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