Tetrahydrofuran → 8-Cyclopropyl-3,4-dihydro-4,4-dimethyl-6-(trimethylsilanyl)ethynylspiro[2 H 1-benzopyran-2,1'-cyclopropane]

HRID 1861371Notes

Reaction equation

HRID 1861371 reaction equation
Br[C:2]1[CH:3]=[C:4]([CH:16]2[CH2:18][CH2:17]2)[C:5]2[O:12][C:9]3([CH2:11][CH2:10]3)[CH2:8][C:7]([CH3:14])([CH3:13])[C:6]=2[CH:15]=1.[CH3:19][Si:20]([C:23]#[CH:24])([CH3:22])[CH3:21].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>[CH:16]1([C:4]2[C:5]3[O:12][C:9]4([CH2:11][CH2:10]4)[CH2:8][C:7]([CH3:13])([CH3:14])[C:6]=3[CH:15]=[C:2]([C:24]#[C:23][Si:20]([CH3:22])([CH3:21])[CH3:19])[CH:3]=2)[CH2:17][CH2:18]1

Participants

9

Reactant 4

HCID 8028TetrahydrofuranHCID 8471TriethylamineHCID 66111TrimethylsilylacetyleneHCID 225689116-Bromo-8-cyclopropyl-3,4-dihydro-4,4-dimethylspiro[2H-1-benzopyran-2,1'-cyclopropane]2×

Product 1

HCID 225688398-Cyclopropyl-3,4-dihydro-4,4-dimethyl-6-(trimethylsilanyl)ethynylspiro[2 H 1-benzopyran-2,1'-cyclopropane]

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 6-bromo-8-cyclopropyl-3,4-dihydro-4,4-dimethylspiro[2H-1-benzopyran-2,1′-cyclopropane] (Intermediate 42, 0.74 g, 2.4 mmol), (trimethylsilyl)acetylene (4 mL, 28 mmol), triethyl amine (8 mL), anhydrous tetrahydrofuran, copper(I)iodide (0.050 g, 0.26 mmol) and dichlorobis(triphenylphosphine)palladium(II) (0.15 g, 0.22 mmol), followed by flash column chromatography over silica gel (230-400 mesh) using 1-2% ethyl acetate in hexane as the eluent, the title compound was obtained as an oil (0.62 g, 80%).

Sources & evidence

ORD record
ord-aa7e1e6cf2b74362a9f4e57065cd529b
Source dataset
uspto-grants-2003_03
Patent number
US06531599B2

Reaction notes

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