tert-Butyl-1-(benzoylcarbamothioyl)-6a-phenyl-3,3a,4,6-tetrahydropyrrolo[3,4-c]isoxazole-5-carboxylate → tert-Butyl(3S,4R)-3-(benzoylcarbamothioylamino)-4-(hydroxymethyl)-3-phenyl-pyrrolidine-1-carboxylate

HRID 338112Notes

Reaction equation

HRID 338112 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:15][CH:14]2[C:10]([C:27]3[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=3)([N:11]([C:16](=[S:26])[NH:17][C:18](=[O:25])[C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)[O:12][CH2:13]2)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]>[Zn].C(O)(=O)C>[C:18]([NH:17][C:16]([NH:11][C@:10]1([C:27]2[CH:28]=[CH:29][CH:30]=[CH:31][CH:32]=2)[C@H:14]([CH2:13][OH:12])[CH2:15][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH2:9]1)=[S:26])(=[O:25])[C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1

Participants

4

Reactant 1

HCID 86697923tert-Butyl-1-(benzoylcarbamothioyl)-6a-phenyl-3,3a,4,6-tetrahydropyrrolo[3,4-c]isoxazole-5-carboxylate

Product 1

HCID 86697927tert-Butyl(3S,4R)-3-(benzoylcarbamothioylamino)-4-(hydroxymethyl)-3-phenyl-pyrrolidine-1-carboxylateYield 70%

Reagents, catalysts & solvents 2

HCID 23994ZincCatalystHCID 176Acetic AcidSolvent

Conditions

Temperature
40 °C

Procedure

A mixture of tert-butyl-1-(benzoylcarbamothioyl)-6a-phenyl-3,3a,4,6-tetrahydropyrrolo[3,4-c]isoxazole-5-carboxylate (2.3 g, 5.1 mmol), acetic acid (20 mL), and powdered zinc (3.3 g, 50 mmol) is vigorously stirred at 40° C. for 1 hour, followed by an additional hour at 45-50° C. The reaction is concentrated under reduced pressure. To the residue is added diatomaceous earth and water, followed by a saturated solution of sodium bicarbonate. The mixture is filtered and washed with ethyl acetate. The filtrate is extracted with ethyl acetate. The organic layers are combined, dried over sodium sulfate, filtered, and concentrated under reduced pressure to give a residue. The residue is purified by silica gel flash chromatography, eluting with hexane/ethyl acetate (1:0) to hexane/ethyl acetate (0:1) to give the title compound (1.6 g, 70%). ES/MS (m/e): 456 (M+H).

Workup

  1. waitfollowed by an additional hour at 45-50° C
  2. concentrationThe reaction is concentrated under reduced pressure
  3. additionTo the residue is added diatomaceous earth and water
  4. filtrationThe mixture is filtered
  5. washwashed with ethyl acetate
  6. extractionThe filtrate is extracted with ethyl acetate
  7. dry with materialdried over sodium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated under reduced pressure
  10. customto give a residue
  11. customThe residue is purified by silica gel flash chromatography
  12. washeluting with hexane/ethyl acetate (1:0) to hexane/ethyl acetate (0:1)

Sources & evidence

ORD record
ord-4002cef1fd194ff6abab01ec3c3a7e41
Source dataset
uspto-grants-2014_11
Patent number
US08889856B2

Reaction notes

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