2,2,6,6-Tetramethylpiperidine → 2-Benzhydryloxycarbonyl-7-t-butoxycarbonylamino-3-(2-mesyloxy-prop-1-en-1-yl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene

HRID 463584Notes

Reaction equation

HRID 463584 reaction equation
C([Li])CCC.CC1(C)CCCC(C)(C)N1.[CH2:16]([C:20]1[CH2:27][S:26][CH:25]2[N:22]([C:23](=[O:36])[CH:24]2[NH:28][C:29]([O:31][C:32]([CH3:35])([CH3:34])[CH3:33])=[O:30])[C:21]=1[C:37]([O:39][CH:40]([C:47]1[CH:52]=[CH:51][CH:50]=[CH:49][CH:48]=1)[C:41]1[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1)=[O:38])[C:17]([CH3:19])=[O:18].[CH3:53][S:54](Cl)(=[O:56])=[O:55]>CCCCCC.O1CCCC1.C(OCC)(=O)C.CN(P(N(C)C)(N(C)C)=O)C>[CH:40]([O:39][C:37]([C:21]1[N:22]2[CH:25]([S:26][CH2:27][C:20]=1[CH:16]=[C:17]([O:18][S:54]([CH3:53])(=[O:56])=[O:55])[CH3:19])[CH:24]([NH:28][C:29]([O:31][C:32]([CH3:35])([CH3:33])[CH3:34])=[O:30])[C:23]2=[O:36])=[O:38])([C:47]1[CH:48]=[CH:49][CH:50]=[CH:51][CH:52]=1)[C:41]1[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1

Participants

9

Reactant 4

HCID 130352,2,6,6-TetramethylpiperidineHCID 31297Methanesulfonyl chlorideHCID 132333103-Acetonyl-2-benzhydryloxycarbonyl-7-t-butoxycarbonylamino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-eneHCID 178418339Butyllithium

Product 1

HCID 540532232-Benzhydryloxycarbonyl-7-t-butoxycarbonylamino-3-(2-mesyloxy-prop-1-en-1-yl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene

Reagents, catalysts & solvents 4

HCID 8028TetrahydrofuranSolvent3×HCID 8058HexaneSolventHCID 8857Ethyl AcetateSolventHCID 12679HexamethylphosphoramideSolvent

Conditions

Temperature
20 °C

Procedure

A 1.6M solution of butyllithium in hexane (10.3 cc) is added, in the course of 10 minutes, to a solution of 2,2,6,6-tetramethylpiperidine (2.33 g) in tetrahydrofuran (15 cc) at 20° C. The mixture is stirred for 20 minutes at 20° C. and then cooled to -70° C. A solution of 3-acetonyl-2-benzhydryloxycarbonyl-7-t-butoxycarbonylamino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene (7.61 g) in tetrahydrofuran (20 cc) is then added in the course of 15 minutes. The mixture is stirred for a further 20 minutes at -70° C. and hexamethylphosphorotriamide (15 cc) is then added in the course of 3 minutes, followed by a solution of methanesulphonyl chloride (4.5 cc) in tetrahydrofuran (10 cc) in the course of 3 minutes. The mixture is stirred for 45 minutes at -70° C., the temperature is then left to rise to 0° C. and the mixture is diluted with ethyl acetate (300 cc). The solution is washed successively with a saturated solution of sodium bicarbonate (100 cc) and distilled water (100 cc), dried over sodium sulphate and concentrated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 20° C. The residue is chromatographed on a column of Merck silica gel (0.06-0.20) (150 g) (diameter of the column: 3.7 cm; height: 30 cm). Elution is carried out with a 22/78 (by volume) ethyl acetate/cyclohexane mixture (2.5 liters), 100 cc fractions being collected. Fractions 12 to 20 are concentrated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 20° C. This yields the Z form of 2-benzhydryloxycarbonyl-7-t-butoxycarbonylamino-3-(2-mesyloxy-prop-1-en-1-yl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene (3.2 g) in the form of a hard, pale yellow foam.

Workup

  1. temperaturecooled to -70° C
  2. stirringThe mixture is stirred for a further 20 minutes at -70° C.
  3. stirringThe mixture is stirred for 45 minutes at -70° C.
  4. waitthe temperature is then left
  5. customto rise to 0° C.
  6. washThe solution is washed successively with a saturated solution of sodium bicarbonate (100 cc)
  7. distillationdistilled water (100 cc)
  8. dry with materialdried over sodium sulphate
  9. concentrationconcentrated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 20° C
  10. customThe residue is chromatographed on a column of Merck silica gel (0.06-0.20) (150 g) (diameter of the column
  11. washElution
  12. custombeing collected
  13. concentrationFractions 12 to 20 are concentrated to dryness under reduced pressure (20 mm Hg; 2.7 kPa) at 20° C

Sources & evidence

ORD record
ord-db31f80485ad4fada800357c84f4a631
Source dataset
uspto-grants-1985_05
Patent number
US04520193

Reaction notes

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