Water → ethyl 2-phenyl-5-(3-(tetrahydro-2H-pyran-2-yloxy)prop-1-ynyl)thiazole-4-carboxylate

HRID 1799114Notes

Reaction equation

Br[C:2]1[S:6][C:5]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)=[N:4][C:3]=1[C:13]([O:15][CH2:16][CH3:17])=[O:14].[CH2:18]([O:21][CH:22]1[CH2:27][CH2:26][CH2:25][CH2:24][O:23]1)[C:19]#[CH:20].C(N(CC)CC)C.O>C1COCC1.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.[Cu]I>[C:7]1([C:5]2[S:6][C:2]([C:20]#[C:19][CH2:18][O:21][CH:22]3[CH2:27][CH2:26][CH2:25][CH2:24][O:23]3)=[C:3]([C:13]([O:15][CH2:16][CH3:17])=[O:14])[N:4]=2)[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1

Participants

Conditions

Temperature: 100 °C

Procedure

Nitrogen was bubbled through a solution of Ethyl 5-bromo-2-phenylthiazole-4-carboxylate (3.6 g, 11.5 mmol) and 2-(prop-2-ynyloxy)tetrahydro-2H-pyran (3.3 mL, 23.1 mmol) in THF (30 mL). Dichlorobis(triphenylphosphine)palladium (II) (405 mg, 0.6 mmol), copper (I) iodide (55 mg, 0.3 mmol), and triethylamine (TEA) (8 mL, 57.7 mmol) were added and the reaction mixture was heated at 100° C. for 30 min in a microwave reactor. The reaction mixture was poured into H2O and extracted with EtOAc. The combined organics were washed with brine, dried (MgSO4), and concentrated. The crude product was purified by MPLC eluting with pentane/EtOAc (0-50% gradient) to give ethyl 2-phenyl-5-(3-(tetrahydro-2H-pyran-2-yloxy)prop-1-ynyl)thiazole-4-carboxylate (3.8 g, 88% yield).

Workup

extractionextracted with EtOAc
washThe combined organics were washed with brine
dry with materialdried (MgSO4)
concentrationconcentrated
customThe crude product was purified by MPLC
washeluting with pentane/EtOAc (0-50% gradient)

Sources & evidence

ORD record: ord-75ab3da032454e33b3d36100f27ca28b
Source dataset: uspto-grants-2013_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08343997B2

Reaction notes

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