Lithium borohydride → 1-(benzo[d][1,3]dioxol-5-yl)-N-(3-bromo-4-(hydroxymethyl)phenyl)cyclopropanecarboxamide

HRID 2242706Notes

Reaction equation

[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([C:10]3([C:13]([NH:15][C:16]4[CH:25]=[CH:24][C:19]([C:20](OC)=[O:21])=[C:18]([Br:26])[CH:17]=4)=[O:14])[CH2:12][CH2:11]3)=[CH:9][C:4]=2[O:3][CH2:2]1.[Li+].[BH4-]>C1COCC1.CCOCC.O>[O:1]1[C:5]2[CH:6]=[CH:7][C:8]([C:10]3([C:13]([NH:15][C:16]4[CH:25]=[CH:24][C:19]([CH2:20][OH:21])=[C:18]([Br:26])[CH:17]=4)=[O:14])[CH2:12][CH2:11]3)=[CH:9][C:4]=2[O:3][CH2:2]1

Participants

Conditions

Temperature: 25 °C

Procedure

Methyl 4-(1-(benzo[d][1,3]dioxol-5-yl)cyclopropanecarboxamido)-2-bromobenzoate (4.12 g, 9.9 mmol) was added to a solution of LiBH4 (429 mg, 19.8 mmol) in THF/ether/H2O (20/20/1 mL) and was allowed to stir at 25° C. After 16 hours, the reaction was quenched with H2O (10 mL). The reaction mixture was diluted with dichloromethane (25 mL) and was extracted with 1N HCl (30 mL×3) and brine (30 mL). The organic extracts were dried over Na2SO4 and evaporated. The crude product was purified by chromatography on silica gel (eluting with 0-100% ethyl acetate in hexanes) to afford 1-(benzo[d][1,3]dioxol-5-yl)-N-(3-bromo-4-(hydroxymethyl)phenyl)cyclopropanecarboxamide (2.84 g, 74%). ESI-MS m/z calc. 389.0, found 390.1 (M+1)+; retention time 2.91 minutes.

Workup

customthe reaction was quenched with H2O (10 mL)
additionThe reaction mixture was diluted with dichloromethane (25 mL)
extractionwas extracted with 1N HCl (30 mL×3) and brine (30 mL)
dry with materialThe organic extracts were dried over Na2SO4
customevaporated
customThe crude product was purified by chromatography on silica gel (eluting with 0-100% ethyl acetate in hexanes)

Sources & evidence

ORD record: ord-47a8c0de13c44c6fb7b6562e20cccf91
Source dataset: uspto-grants-2010_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07671221B2

Reaction notes

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