Water → HCID 22315284, compound

HRID 1355207Notes

Reaction equation

B(Br)(Br)Br.[CH:5]1([CH2:10][CH:11]([C:20]2[CH:25]=[CH:24][C:23]([O:26]C)=[C:22]([O:28]C)[CH:21]=2)[C:12]([NH:14][C:15]2[S:16][CH:17]=[CH:18][N:19]=2)=[O:13])[CH2:9][CH2:8][CH2:7][CH2:6]1.[OH-].[NH4+].O>C(Cl)Cl>[CH:5]1([CH2:10][CH:11]([C:20]2[CH:25]=[CH:24][C:23]([OH:26])=[C:22]([OH:28])[CH:21]=2)[C:12]([NH:14][C:15]2[S:16][CH:17]=[CH:18][N:19]=2)=[O:13])[CH2:9][CH2:8][CH2:7][CH2:6]1

Participants

Conditions

Temperature: 25 °C

Procedure

A 1.0M solution of boron tribromide in methylene chloride (7.43 mL, 7.43 mmol) at 25° C. was treated with a solution of 3-cyclopentyl-2-(3,4-dimethoxy-phenyl)-N-thiazol-2-yl-propionamide (prepared as in Example 113, 0.27 g, 0.74 mmol) in methylene chloride (7.43 mL). This solution was stirred at 25° C. for 1 h. At this time, the reaction was cooled to 0° C. and treated with a dilute aqueous ammonium hydroxide solution. This mixture was stirred at 0° C. for 20 min. At this time, the reaction was poured into water and was extracted with chloroform (3×50 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dihydroxy-phenyl)-N-thiazol-2-yl-propionamide (38.8 mg, 15.7%) as a white solid: mp 170–173° C.; EI-HRMS m/e calcd for C17H20N2O3S (M+) 332.1194 found 332.1192.

Workup

temperatureAt this time, the reaction was cooled to 0° C.
stirringThis mixture was stirred at 0° C. for 20 min
extractionwas extracted with chloroform (3×50 mL)
dry with materialThe combined organic layers were dried over sodium sulfate
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-30624496c0e642bab0f88de868bc923a
Source dataset: uspto-grants-2007_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07223868B2

Reaction notes

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