Dichloromethane → 6-(4-methoxybenzyl)-8-vinylthieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one

HRID 707458Notes

Reaction equation

Br[C:2]1[S:10][C:9]2[N:8]([CH2:11][C:12]3[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=3)[C:7](=[O:20])[N:6]3[N:21]=[CH:22][N:23]=[C:5]3[C:4]=2[CH:3]=1.[B-](F)(F)(F)[CH:25]=[CH2:26].[K+].ClCCl.C(N(CC)CC)C>C(O)CCC.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH3:19][O:18][C:15]1[CH:16]=[CH:17][C:12]([CH2:11][N:8]2[C:9]3[S:10][C:2]([CH:25]=[CH2:26])=[CH:3][C:4]=3[C:5]3=[N:23][CH:22]=[N:21][N:6]3[C:7]2=[O:20])=[CH:13][CH:14]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To mixture of 8-bromo-6-(4-methoxybenzyl)thieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one (4.00 g, 10.2 mmol), potassium trifluoro(vinyl)borate (2.05 g, 15.3 mmol), and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with dichloromethane (417.5 mg, 0.51 mmol) in butan-1-ol (30 ml) was added triethylamine (1.43 ml, 0.01 mol). The resulting mixture was heated to 100° C. Next morning the crude mixture was cooled to room temperature at which time the solvent was removed under reduced pressure. The residue was purified over silica gel eluting with 0-20% IPA in ethyl acetate to yield 6-(4-methoxybenzyl)-8-vinylthieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one as a brown solid (2.90 g, 84%). 1H NMR (400 MHz, DMSO-d6) δ 3.74 (s, 3H), 5.24-5.30 (m, 1H), 5.34 (s, 2H), 5.52-5.63 (m, 1H), 6.94 (d, J=8.66 Hz, 2H), 7.41 (d, J=8.53 Hz, 2H), 7.60 (s, 1H), 8.51 (s, 1H). LCMS (MH+, 339.2).

Workup

customwas removed under reduced pressure
customThe residue was purified over silica gel eluting with 0-20% IPA in ethyl acetate

Sources & evidence

ORD record: ord-d55a4b9f290943b287242ca6898705bb
Source dataset: uspto-grants-2015_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09175010B2

Reaction notes

Loading…