3-Methyl-isothiazole → HCID 59556170, compound

HRID 1025795Notes

Reaction equation

HRID 1025795 reaction equation
C([Li])CCC.[CH3:6][C:7]1[CH:11]=[CH:10][S:9][N:8]=1.[O:12]1[C:16]2([CH2:21][CH2:20][C:19](=[O:22])[CH2:18][CH2:17]2)[O:15][CH2:14][CH2:13]1>CCCCCC.O1CCCC1>[CH3:6][C:7]1[CH:11]=[C:10]([C:19]2([OH:22])[CH2:20][CH2:21][C:16]3([O:15][CH2:14][CH2:13][O:12]3)[CH2:17][CH2:18]2)[S:9][N:8]=1

Participants

6

Reactant 3

HCID 127473-Methyl-isothiazoleHCID 5674151,4-Dioxaspiro[4.5]decan-8-oneHCID 178418339Butyllithium

Product 1

HCID 59556170HCID 59556170, compoundYield 70.6%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8058HexaneSolvent

Procedure

At −78° C., 1.5 M of n-butyllithium in hexane (6.7 mL) was slowly added to a solution of 3-methylisothiazole (1.0 g, 0.010 mol) in tetrahydrofuran (15 mL) over a period of 20 min. After being stirred for another 30 min, 1,4-dioxa-spiro[4.5]decan-8-one (1.56 g, 0.00999 mol) in tetrahydrofuran (5 mL) was added within 10 min. The reaction mixture was stirred for another 2 hour at −78° C. and allowed to warm up overnight to room temperature. After quenching with brine, the mixture was extracted with EtOAc. The organic layer was dried and concentrated. Chromatography on silica gel eluting with hexane/EtOAc (1:5˜1:1) provided 1.8 g (70.6%) of the title compound. MS (M+H)+ 256.

Workup

  1. stirringThe reaction mixture was stirred for another 2 hour at −78° C.
  2. temperatureto warm up overnight to room temperature
  3. customAfter quenching with brine
  4. extractionthe mixture was extracted with EtOAc
  5. customThe organic layer was dried
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-ac444c1153ca42ee853b603cdc3145ac
Source dataset
uspto-grants-2014_05
Patent number
US08729063B2

Reaction notes

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