L-Proline → (S)-6-chloro-1,2,3,11a-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11(10H)-dione

HRID 67602Notes

Reaction equation

HRID 67602 reaction equation
[Cl:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[NH:12][C:11](=[O:13])[O:10][C:8](=O)[C:7]=12.[NH:14]1[CH2:21][CH2:20][CH2:19][C@H:15]1C(O)=O>CS(C)=O>[Cl:1][C:2]1[C:7]2[C:8](=[O:10])[N:14]3[CH2:21][CH2:20][CH2:19][C@H:15]3[C:11](=[O:13])[NH:12][C:6]=2[CH:5]=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 145742L-ProlineHCID 6390585-chloro-2,4-dihydro-1H-3,1-benzoxazine-2,4-dione

Product 1

HCID 22819143(S)-6-chloro-1,2,3,11a-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11(10H)-dione

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

10 g (50.6 mmol) of 6-chloroisatoic acid anhydride are stirred at 110° C. for 2 hours with 5.82 g (50.6 mmol) of L-proline in 80 ml of dimethyl sulphoxide. The solution is evaporated and the residue is crystallised from ethyl acetate. There is obtained (S)-6-chloro-1,2,3,11a-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11(10H)-dione of melting point 264°-266° C.

Workup

  1. customThe solution is evaporated
  2. customthe residue is crystallised from ethyl acetate

Sources & evidence

ORD record
ord-b4701071799841db80f857174fa96aa3
Source dataset
uspto-grants-1982_08
Patent number
US04346036

Reaction notes

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