Tetrahydrofuran → 8-Ethyl-6-trimethylsilanylethynyl-2,2,4,4-tetramethyl chroman

HRID 2185256Notes

Reaction equation

HRID 2185256 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C:9](=[C:10]([CH2:12][CH3:13])[CH:11]=1)[O:8][C:7]([CH3:15])([CH3:14])[CH2:6][C:5]2([CH3:17])[CH3:16].[CH3:18][Si:19]([C:22]#[CH:23])([CH3:21])[CH3:20].C(N(CC)CC)C.O1CCCC1>CCCCCC.[Cu]I.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.C(OCC)(=O)C>[CH2:12]([C:10]1[CH:11]=[C:2]([C:23]#[C:22][Si:19]([CH3:21])([CH3:20])[CH3:18])[CH:3]=[C:4]2[C:9]=1[O:8][C:7]([CH3:15])([CH3:14])[CH2:6][C:5]2([CH3:17])[CH3:16])[CH3:13]

Participants

9

Reactant 4

HCID 8028TetrahydrofuranHCID 8471TriethylamineHCID 66111TrimethylsilylacetyleneHCID 695485316-Bromo-8-ethyl-2,2,4,4-tetramethyl chroman2×

Product 1

HCID 695486138-Ethyl-6-trimethylsilanylethynyl-2,2,4,4-tetramethyl chroman

Reagents, catalysts & solvents 4

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 8058HexaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

Following general procedure D and using 6-bromo-8-ethyl-2,2,4,4-tetramethyl chroman (Intermediate 46, 0.5 g, 1.61 mmol), (trimethylsilyl)acetylene (1.57 g, 16.1 mmol), triethyl amine (8 mL), anhydrous tetrahydrofuran (10 mL), copper(I)iodide (0.025 g, 0.13 mmol) and dichlorobis(triphenylphosphine)palladium(II) (0.075 g, 0.11 mmol), followed by flash column chromatography over silica gel (230-400 mesh) using 5% ethyl acetate in hexane as the eluent, the title compound was obtained as an oil (0.137 g, 27%).

Sources & evidence

ORD record
ord-21ddafe3608a4be388df4a8a20ae7ff1
Source dataset
uspto-grants-2002_06
Patent number
US06399774B1

Reaction notes

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