m-Xylyl bromide → HCID 21193326, compound

HRID 1068457Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH2:23][CH2:22][CH:11]([C:12]([O:14][CH2:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)=[O:13])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C[Si]([N-][Si](C)(C)C)(C)C.[Na+].[CH3:34][C:35]1[CH:36]=[C:37]([CH:40]=[CH:41][CH:42]=1)[CH2:38]Br>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:9][CH2:10][C:11]([CH2:34][C:35]2[CH:42]=[CH:41][CH:40]=[C:37]([CH3:38])[CH:36]=2)([C:12]([O:14][CH2:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)=[O:13])[CH2:22][CH2:23]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: -78 °C

Procedure

To a cold (−78° C.) solution of benzyl N-tert-butoxycarbonyl-isonipecotate (8.02 g, 25.11 mmol) in anhydrous THF (80 mL), a solution of sodium bis(trimethysilyl)amide (35 mL, 35 mmol; 1 M) in THF was added over a period of 10 min. The resulting orange solution was stirred at −78° C. for 1 h. and then treated dropwise with 3-methylbenzyl bromide (4.1 mL, 30.6 mmol). The reaction mixture was allowed to warm to room temp., and stirred overnight. The reaction was quenched with saturated aqueous ammonium chloride, diluted with water, and extracted with ethyl acetate. The organic extracts were combined, washed with brine, and concentrated under vacuum. The residual oil was subjected to column chromatography on silica eluting with 20% ethyl acetate in hexane. Collection and concentration of appropriate fractions provided the title product.

Workup

temperatureto warm to room temp.
stirringstirred overnight
customThe reaction was quenched with saturated aqueous ammonium chloride
additiondiluted with water
extractionextracted with ethyl acetate
washwashed with brine
concentrationconcentrated under vacuum
customCollection and concentration of appropriate fractions

Sources & evidence

ORD record: ord-0dbf9857b43f46cf88a4b576182fb71c
Source dataset: uspto-grants-2001_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06248756B1

Reaction notes

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