2,2-Dimethoxypropane → 1-((S)-1-(tert-butyldimethylsilyloxy)-3-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)propan-2-yl)-3-(2-chloro-3-fluorobenzyl)-1-methylurea

HRID 409848Notes

Reaction equation

HRID 409848 reaction equation
[Si:1]([O:8][CH2:9][C@@H:10]([N:16]([CH3:29])[C:17]([NH:19][CH2:20][C:21]1[CH:26]=[CH:25][CH:24]=[C:23]([F:27])[C:22]=1[Cl:28])=[O:18])[CH2:11][C@@H:12]([OH:15])[CH2:13][OH:14])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].CO[C:32](OC)([CH3:34])[CH3:33].CC1C=CC(S([O-])(=O)=O)=CC=1.C1C=C[NH+]=CC=1.C([O-])(O)=O.[Na+]>CN(C=O)C>[Si:1]([O:8][CH2:9][C@@H:10]([N:16]([CH3:29])[C:17]([NH:19][CH2:20][C:21]1[CH:26]=[CH:25][CH:24]=[C:23]([F:27])[C:22]=1[Cl:28])=[O:18])[CH2:11][C@@H:12]1[CH2:13][O:14][C:32]([CH3:34])([CH3:33])[O:15]1)([C:4]([CH3:5])([CH3:7])[CH3:6])([CH3:2])[CH3:3]

Participants

6

Reactant 4

HCID 64952,2-DimethoxypropaneHCID 466102Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1)HCID 516892Sodium BicarbonateHCID 579478331-((2S,4R)-1-(tert-butyldimethylsilyloxy)-4,5-dihydroxypentan-2-yl)-3-(2-chloro-3-fluorobenzyl)-1-methylurea

Product 1

HCID 579477701-((S)-1-(tert-butyldimethylsilyloxy)-3-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)propan-2-yl)-3-(2-chloro-3-fluorobenzyl)-1-methylurea

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of the 1-((2S,4R)-1-(tert-butyldimethylsilyloxy)-4,5-dihydroxypentan-2-yl)-3-(2-chloro-3-fluorobenzyl)-1-methylurea 1 (4.5 g, 10.0 mmol) in DMF (170 mL) were added 2,2-dimethoxypropane (12.45 mL, 100.0 mmol) and PPTS (0.050 g, 0.02 mmol) at 0° C. After 1 h the reaction was warmed up to RT and stirred for an additional 2.5 h. The crude reaction mixture was then added into a saturated aqueous solution of NaHCO3 (350 mL) and extracted with EtOAc (3×300 mL). Combined organic layers were washed with Brine (2×400 mL) and dried over MgSO4. The solution was then concentrated to give 1-((S)-1-(tert-butyldimethylsilyloxy)-3-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)propan-2-yl)-3-(2-chloro-3-fluorobenzyl)-1-methylurea, which was used without further purification. LRMS (M+H+) m/z 490.1.

Workup

  1. customThe crude reaction mixture
  2. extractionextracted with EtOAc (3×300 mL)
  3. washCombined organic layers were washed with Brine (2×400 mL)
  4. dry with materialdried over MgSO4
  5. concentrationThe solution was then concentrated

Sources & evidence

ORD record
ord-df778e9c791d49f89501eabb218af1e9
Source dataset
uspto-grants-2014_06
Patent number
US08759374B2

Reaction notes

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