Ethyl Acetate → (R)-(-)-2-oxo-3-tert-butoxycarbonylamino-5-phenyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine

HRID 352383

Reaction equation

[O:1]=[C:2]1[NH:8][C:7]2[CH:9]=[CH:10][CH:11]=[CH:12][C:6]=2[NH:5][CH2:4][C@H:3]1[NH:13][C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15].[CH:21]1[CH2:28][CH2:27][CH2:26][CH2:25][CH2:24]CC=1.C(OCC)(=O)C>C1(=O)CCCCC1.[C].[Pd]>[O:1]=[C:2]1[NH:8][C:7]2[CH:9]=[CH:10][CH:11]=[CH:12][C:6]=2[N:5]([C:24]2[CH:25]=[CH:26][CH:27]=[CH:28][CH:21]=2)[CH2:4][C@H:3]1[NH:13][C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15]

Participants

Conditions

Temperature: 145 °C

Procedure

To a solution of 5 g of (R)-(+)-2-oxo-3-tert-butoxycarbonylamino-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine in 25 ml of cyclohexanone were added 5.96 g of cyclooctene and 0.5 g of 10% palladium carbon. The mixture was stirred at the internal temperature of 145° C. for 2.5 hours. After the reaction mixture was cooled to room temperature, 20 ml of ethyl acetate was added. The mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was crystallized by adding thereto diisopropyl ether and n-hexane and the resulting crystals were collected by filtration, whereby 3.2 g of the title compound was obtained.

Workup

temperatureAfter the reaction mixture was cooled to room temperature
filtrationThe mixture was filtered
concentrationthe filtrate was concentrated under reduced pressure
customThe residue was crystallized
additionby adding
filtrationdiisopropyl ether and n-hexane and the resulting crystals were collected by filtration

Sources & evidence

ORD record: ord-cd97a41839564bccb51d26a6e8f7ae1f
Source dataset: uspto-grants-2004_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06747022B2

Linked notes

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