Aluminium lithium hydride → 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-hydroxymethyl-pyridin-2-yl)propionamide

HRID 398606Notes

Reaction equation

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

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of 6-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionylamino]-nicotinic acid methyl ester (prepared as in Example 45, 398 mg, 0.95 mmol) in diethyl ether (30 mL) was cooled to 0° C. and then treated with lithium aluminum hydride (54 mg, 1.4 mmol) in one portion. There was immediate gas evolution. The reaction mixture was allowed to slowly warm to 25° C. and was stirred at 25° C. 16 h. After such time, the reaction mixture was diluted with water (10 mL) and then extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichloro-phenyl)-N-(5-hydroxymethyl-pyridin-2-yl) propionamide (131 mg, 35%) as a white foam: FAB-HRMS m/e calcd for C20H22Cl2N2O2 (M+H)+ 392.1058, found 392.1062.

Workup

custom16 h
extractionextracted with ethyl acetate (3×15 mL)
dry with materialThe combined organic layers were dried over sodium sulfate
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-e50a1ccbb6df48c28182dacea8cdc197
Source dataset: uspto-grants-2003_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06610846B1

Reaction notes

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