Dichloromethane → tert-butyl (8S,9aR)-8-hydroxy-5-oxohexahydro-1H-pyrrolo[1,2-a][1,4]diazepine-2(3H)-carboxylate

HRID 572040Notes

Reaction equation

HRID 572040 reaction equation
[N+](C1C=CC(C([O:10][C@@H:11]2[CH2:28][N:14]3[C:15](=[O:27])[CH2:16][CH2:17][N:18]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:19][C@H:13]3[CH2:12]2)=O)=CC=1)([O-])=O.C(=O)([O-])[O-].[K+].[K+].ClCCl>CO>[OH:10][C@@H:11]1[CH2:28][N:14]2[C:15](=[O:27])[CH2:16][CH2:17][N:18]([C:20]([O:22][C:23]([CH3:24])([CH3:25])[CH3:26])=[O:21])[CH2:19][C@H:13]2[CH2:12]1

Participants

5

Reactant 3

HCID 6344DichloromethaneHCID 11430Potassium CarbonateHCID 86723191tert-butyl (8S,9aR)-8-[(4-nitrobenzoyl)oxy]-5-oxohexahydro-1H-pyrrolo[1,2-a][1,4]diazepine-2(3H)-carboxylate

Product 1

HCID 86723192tert-butyl (8S,9aR)-8-hydroxy-5-oxohexahydro-1H-pyrrolo[1,2-a][1,4]diazepine-2(3H)-carboxylateYield 64.6%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

tert-Butyl (8S,9aR)-8-[(4-nitrobenzoyl)oxy]-5-oxohexahydro-1H-pyrrolo[1,2-a][1,4]diazepine-2(3H)-carboxylate (156 mg, 0.372 mmol, 1.0 equivalent, Part E) was dissolved in methanol (3 mL). Potassium carbonate (20 mg, 0.145 mmol, 0.39 equivalent) was added and stirring was continued at room temperature for 30 minutes. The solvent was removed in vacuo, and the crude material was loaded onto a 12-g silica column with dichloromethane and eluted with 0-5% methanol:dichloromethane over 15 minutes, held at 5% methanol:dichloromethane for five minutes, then eluted with 10% methanol:dichloromethane for 10 minutes to afford the titled compound (65 mg, 0.240 mmol, 64.6% yield over two steps) as a white solid. 1H NMR (300 MHz, CDCl3) δ ppm 4.44 (t, J=3.7 Hz, 1H), 4.39-3.86 (m, J=79.8 Hz, 2H), 4.06 (dt, J=17.5, 8.9 Hz, 1H), 3.83 (dd, J=13.2, 2.3 Hz, 1H), 3.51 (dd, J=13.2, 3.7 Hz, 1H), 3.35-2.96 (br s, 1H), 2.74-2.46 (m, 3H), 2.24 (dd, J=13.2, 6.0 Hz, 1H), 1.74 (ddd, J=12.0, 9.0, 3.0 Hz, 1H), 1.48 (s, 9H); MS (ESI+) m/z 270.9 (M+H)+.

Workup

  1. customThe solvent was removed in vacuo
  2. washeluted with 0-5% methanol
  3. waitdichloromethane over 15 minutes
  4. waitdichloromethane for five minutes
  5. washeluted with 10% methanol

Sources & evidence

ORD record
ord-ec2c16a443fa4e3eb37f6b810fd609c3
Source dataset
uspto-grants-2015_05
Patent number
US09029361B2

Reaction notes

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