Phosphoric Acid → Isoquinoline, 4-cyclopropyl-

HRID 1852212Notes

Reaction equation

Br[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH:5]=[N:4][CH:3]=1.[CH:12]1(B(O)O)[CH2:14][CH2:13]1.P(=O)(O)(O)O.[K].C1(P(C2CCCCC2)C2CCCCC2)CCCCC1>C1(C)C=CC=CC=1.O.O.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH:12]1([C:2]2[C:11]3[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=3)[CH:5]=[N:4][CH:3]=2)[CH2:14][CH2:13]1

Participants

Conditions

Temperature: 100 °C

Procedure

To a solution of 4-bromoisoquinoline (0.5 g, 2.403 mmol) and cyclopropylboronic acid (0.248 g, 2.88 mmol) in Toluene/water (11 ml, 10:1) was added phosphoric acid, potassium salt (1.02 g, 4.81 mmol) followed by addition of tricyclohexylphosphine (0.067 g, 0.240 mmol) and palladium(II) acetate (0.027 g, 0.120 mmol). The reaction mass was heated 100° C. and stirred for overnight. The reaction mass was diluted with water and extracted with ethyl acetate. The organic layer was dried over anhydrous Na2SO4 and evaporated under reduced pressure to get crude compound. The crude compound was purified by silica gel chromatography (10% ethyl acetate in pet ether) to get desired compound (0.4 g, 93%) as an oil. 1H NMR (400 MHz, CDCl3): δ ppm 9.12(s, 1H), 8.34-8.32 (d, J=8 Hz, 1H), 8.31 (s, 1H), 7.98-7.96 (d, J=8 Hz, 1H), 7.76 (t, J=4 Hz, 1H), 7.62 (t, J=4 Hz, 1H), 2.23 (s, 1H), 1.11 (t, J=4 Hz, 2H), 0.82 (t, J=8 Hz, 2H).

Workup

extractionextracted with ethyl acetate
dry with materialThe organic layer was dried over anhydrous Na2SO4
customevaporated under reduced pressure
customto get crude compound
customThe crude compound was purified by silica gel chromatography (10% ethyl acetate in pet ether)

Sources & evidence

ORD record: ord-fd88227fc1cc4ee299860777781add02
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08957203B2

Reaction notes

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