Trimethylsilylacetylene → Methyl 4-(pyrrolidin-1-ylcarbonyl)-3-(2-trimethylsilylethynyl)benzoate

HRID 2053763Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][C:11]=1[C:12]([N:14]1[CH2:18][CH2:17][CH2:16][CH2:15]1)=[O:13])[C:5]([O:7][CH3:8])=[O:6].[CH3:19][Si:20]([C:23]#[CH:24])([CH3:22])[CH3:21]>C(NC(C)C)(C)C.C(OCC)(=O)C.[Cu]I>[N:14]1([C:12]([C:11]2[CH:10]=[CH:9][C:4]([C:5]([O:7][CH3:8])=[O:6])=[CH:3][C:2]=2[C:24]#[C:23][Si:20]([CH3:22])([CH3:21])[CH3:19])=[O:13])[CH2:18][CH2:17][CH2:16][CH2:15]1

Participants

Conditions

Temperature: 80 °C

Procedure

18 g (57.7 mmol) of methyl 3-bromo-4-(pyrrolidin-1-ylcarbonyl)benzoate is placed under a nitrogen atmosphere together with 6.66 g (5.77 mmol) of tetrakis-triphenylphosphinepalladium(0) and 0.439 g (2.31 mmol) of copper(1) iodide in 150 mL of N,N-diisopropylamine, the mixture is heated to 80° C. and 16.6 mL (115 mmol) trimethylsilylethyne is added. The reaction mixture is stirred for 8 hours at 80° C. and then for 16 hours at ambient temperature. Then volatile constituents are eliminated in vacuo, the residue is taken up in ethyl acetate, insoluble matter is filtered off, and the solvent is eliminated in vacuo. The residue is purified by chromatography on silica gel (gradient: dichloromethane/ethanol 100:0□95:5). Yield: 7.7 g (41%); Rf value: 0.44 (silica gel; dichloromethane/ethanol=95:5); C18H23NO3Si (329.48); mass spectrum: (M+H)+=330.

Workup

waitfor 16 hours at ambient temperature
filtrationinsoluble matter is filtered off
customThe residue is purified by chromatography on silica gel (gradient: dichloromethane/ethanol 100:0□95:5)

Sources & evidence

ORD record: ord-9ecb5fa6c4f840b19b9f70e14d54589a
Source dataset: uspto-grants-2008_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07326791B2

Reaction notes

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