Hydrochloric Acid → N-Methyl-N-[2-(5-chloro-2,3-dihydro-2-oxo-3-phenyl-3-benzofuranyl)acetyl]leucine

HRID 1723177Notes

Reaction equation

[OH-].[Na+].[CH3:3][NH:4][C@H:5]([C:10]([OH:12])=[O:11])[CH2:6][CH:7]([CH3:9])[CH3:8].[Cl:13][C:14]1[CH:15]=[CH:16][C:17]2[O:21][C:20](=[O:22])[C:19]([CH2:29][C:30](Cl)=[O:31])([C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=3)[C:18]=2[CH:33]=1.Cl>O.O1CCCC1>[CH3:3][N:4]([C:30](=[O:31])[CH2:29][C:19]1([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:18]2[CH:33]=[C:14]([Cl:13])[CH:15]=[CH:16][C:17]=2[O:21][C:20]1=[O:22])[C@H:5]([C:10]([OH:12])=[O:11])[CH2:6][CH:7]([CH3:9])[CH3:8]

Participants

Conditions

Temperature: 5 °C

Procedure

0.9 g of sodium hydroxide is added to a solution of 3 g of N-methylleucine in 70 ml of water and 40 ml of tetrahydrofuran. The medium is then cooled to 5° C. and a solution of 7.3 g of 2-(5-chloro-2,3-dihydro-2-oxo-3-phenyl-3-benzofuranyl)acetyl chloride in 50 ml of tetrahydrofuran and a solution of 0.9 g of sodium hydroxide in 22.7 ml of water are then added simultaneously in small portions so as to maintain the pH at 12. The mixture is stirred for 3 hours at room temperature and 22.7 ml of N hydrochloric acid are added. The medium is concentrated and the precipitate obtained is filtered off and dissolved hot in an ethanol/methanol (50:50) mixture. The solution is filtered and the filtrate evaporated. A crystalline product is obtained.

Workup

temperatureto maintain the pH at 12
concentrationThe medium is concentrated
customthe precipitate obtained
filtrationis filtered off
dissolutiondissolved hot in an ethanol/methanol (50:50) mixture
filtrationThe solution is filtered
customthe filtrate evaporated
customA crystalline product is obtained

Sources & evidence

ORD record: ord-f7e5ff68b1434dc8a64c8f70e3b0ceac
Source dataset: uspto-grants-1989_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04859700

Reaction notes

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