Phthalimide → HCID 59091449, compound

HRID 2188028Notes

Reaction equation

HRID 2188028 reaction equation
[CH2:1]([O:3][C:4]1([O:20][CH2:21][CH3:22])[CH2:9][CH2:8][N:7]([C@H:10]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH3:11])[C@H:6]([CH2:18]O)[CH2:5]1)[CH3:2].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[C:42]1(=[O:52])[NH:46][C:45](=[O:47])[C:44]2=[CH:48][CH:49]=[CH:50][CH:51]=[C:43]12.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[CH2:21]([O:20][C:4]1([O:3][CH2:1][CH3:2])[CH2:9][CH2:8][N:7]([C@H:10]([C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=2)[CH3:11])[C@H:6]([CH2:18][N:46]2[C:42](=[O:52])[C:43]3=[CH:51][CH:50]=[CH:49][CH:48]=[C:44]3[C:45]2=[O:47])[CH2:5]1)[CH3:22]

Participants

6

Reactant 4

HCID 6809PhthalimideHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 22083373HCID 22083373, compound

Product 1

HCID 59091449HCID 59091449, compoundYield 85%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

A suspension of 4,4-diethoxy-1-(1-(S)-phenyl-ethyl)-(S)-2-hydroxymethyl-piperidine (20 g, 65 mmol), triphenylphosphine (18.76 g, 72 mmol) and phthalimide (10.52 g, 72 mmol) in tetrahydrofurane (200 ml) cooled to 0° C. was added diethyl azodicarboxylate (11.34 ml, 72 mmol) over the course of 1 hour. The reaction mixture was stirred at 0° C. for another 2 hours before the volatiles were removed in vacuo. The residue was dissolve in hot heptane-toluene (3:2) (100 ml) before it was cooled on an ice bath. The precipitate was filtered off and washed with heptane. The filtrate was concentrated in vacuo and the residue subjected to column chromatography using a mixture of toluene/ethyl acetate/heptane (3:1:3) as eluent. The solvent was evaporated in vacuo and the residue was crystallized by addition of light petrol ether (250 ml). The precipitate was filtered off, which afforded 24 g (85%) of 4,4-diethoxy-1-(1-(S)-phenyl-ethyl)-2-(S)-phthalimidomethyl-piperidine as a solid.

Workup

  1. customwere removed in vacuo
  2. dissolutionThe residue was dissolve in hot heptane-toluene (3:2) (100 ml) before it
  3. temperaturewas cooled on an ice bath
  4. filtrationThe precipitate was filtered off
  5. washwashed with heptane
  6. concentrationThe filtrate was concentrated in vacuo
  7. additiona mixture of toluene/ethyl acetate/heptane (3:1:3) as eluent
  8. customThe solvent was evaporated in vacuo
  9. customthe residue was crystallized by addition of light petrol ether (250 ml)
  10. filtrationThe precipitate was filtered off

Sources & evidence

ORD record
ord-7aa724c20bdc41928cad50a24ae0b478
Source dataset
uspto-grants-2002_06
Patent number
US06410556B1

Reaction notes

Loading…