Hydrochloric Acid → tert-Butyl ((1R,2S)-1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-1-hydroxypropan-2-yl)carbamate

HRID 1661476Notes

Reaction equation

HRID 1661476 reaction equation
C([Mg]Cl)(C)C.CON(C)[C:9](=[O:20])[C@@H:10]([NH:12][C:13](=[O:19])[O:14][C:15]([CH3:18])([CH3:17])[CH3:16])[CH3:11].[O:22]1[CH2:27][CH2:26][O:25][C:24]2[CH:28]=[C:29]([Mg]Br)[CH:30]=[CH:31][C:23]1=2.Cl>C1COCC1.O>[O:22]1[C:23]2[CH:31]=[CH:30][C:29]([C@@H:9]([OH:20])[C@@H:10]([NH:12][C:13](=[O:19])[O:14][C:15]([CH3:16])([CH3:17])[CH3:18])[CH3:11])=[CH:28][C:24]=2[O:25][CH2:26][CH2:27]1

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 11806530(S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxopropan-2-yl)carbamateHCID 178418918HCID 178418918, compoundHCID 178419614HCID 178419614, compound

Product 1

HCID 59339843tert-Butyl ((1R,2S)-1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-1-hydroxypropan-2-yl)carbamate

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent3×

Procedure

Isopropylmagnesium chloride, 2M in THF (6.5 mL, 13.00 mmol) was added to a suspension of (S)-tert-butyl 1-(methoxy(methyl)amino)-1-oxopropan-2-ylcarbamate (3 g, 12.92 mmol) in THF (30 mL) keeping the temperature below −10° C. (2,3-dihydrobenzo[b][1,4]dioxin-6-yl)magnesium bromide, 0.7M in THF (20 mL, 14.00 mmol) was added. The reaction mixture was stirred at room temperature for 17 hours. 1N HCl (300 mL) was cooled on ice bath to +10° C., the reaction mixture was poured into the acidic water solution and extracted with TBME=tert-butyl methyl ether. The ether phases were washed with water, brine and dried (Na2SO4). Filtration and evaporation of solvents afforded a crude product as a slightly yellow oil that was purified by flash chromatography using TBME:Heptane=1:2 as eluent.

Workup

  1. additionwas added
  2. extractionextracted with TBME=tert-butyl methyl ether
  3. washThe ether phases were washed with water, brine
  4. dry with materialdried (Na2SO4)
  5. filtrationFiltration and evaporation of solvents

Sources & evidence

ORD record
ord-16426c6fdbd54b418a1d6862a765074e
Source dataset
uspto-grants-2011_10
Patent number
US08030340B2

Reaction notes

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