Benzene → HCID 178443799, compound

HRID 1284048Notes

Reaction equation

[N:1]#[N:2].[S:3]([NH:19][C@H:20]([C:28]([OH:30])=[O:29])[CH2:21][CH2:22][CH2:23][NH:24][C:25](=[NH:27])[NH2:26])([C:6]1[C:18]2[CH:17]=[CH:16][CH:15]=[C:11]([N:12]([CH3:14])[CH3:13])[C:10]=2[CH:9]=[CH:8][CH:7]=1)(=[O:5])=[O:4].O.[C:32]1([CH3:42])[CH:37]=[CH:36][C:35]([S:38]([OH:41])(=[O:40])=[O:39])=[CH:34][CH:33]=1.[CH:43]1[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=1>C(C(CCCC)CO)C>[N:1]#[N:2].[C:32]1([CH3:42])[CH:33]=[CH:34][C:35]([S:38]([OH:41])(=[O:39])=[O:40])=[CH:36][CH:37]=1.[C:32]1([CH3:42])[CH:33]=[CH:34][C:35]([S:38]([OH:41])(=[O:39])=[O:40])=[CH:36][CH:37]=1.[CH2:32]([CH:48]([CH2:47][CH2:46][CH2:45][CH3:44])[CH2:43][O:29][C:28](=[O:30])[C@H:20]([CH2:21][CH2:22][CH2:23][NH:24][C:25](=[NH:26])[NH2:27])[NH:19][S:3]([C:6]1[C:18]2[CH:17]=[CH:16][CH:15]=[C:11]([N:12]([CH3:13])[CH3:14])[C:10]=2[CH:9]=[CH:8][CH:7]=1)(=[O:4])=[O:5])[CH3:33]

Participants

Conditions

Temperature: 100 °C

Procedure

A mixture of 1.0 gram of N2 -dansyl-L-arginine and 1.4 gram of p-toluenesulfonic acid monohydrate in 10 ml of 2-ethylhexanol was heated for 30 minutes at 100°C. To the thus otained clear solution, 100 ml of benzene was added, and the mixture was refluxed for 10 hours, removing water by azeotropic distillation. After the solvent was removed by distillation, 100 ml of ethyl ether was added to the residue to give a crystalline mass. Crystallization from acetone gave N2 -dansyl-L-arginine 2-ethylhexyl ester di(p-toluenesulfonate) in 91% yield; mp. 170°-174°C.

Workup

temperaturethe mixture was refluxed for 10 hours
customremoving water
distillationby azeotropic distillation
customAfter the solvent was removed by distillation, 100 ml of ethyl ether
additionwas added to the residue
customto give a crystalline mass
customCrystallization from acetone

Sources & evidence

ORD record: ord-fa5af4b802b246f4a8e341c257286e0d
Source dataset: uspto-grants-1976_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US03978045

Reaction notes

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