Ethanol → 5-((1R)-1-hydroxy-2-{4-[(2S)-2-hydroxy-2-(4-methyl-1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)-4-methyl-2-benzofuran-1(3H)-one

HRID 1187102Notes

Reaction equation

[OH:1][C@H:2]([C:10]1[CH:19]=[CH:18][C:13]2[C:14](=[O:17])[O:15][CH2:16][C:12]=2[C:11]=1[CH3:20])[CH2:3][N:4]1[CH2:9][CH2:8][NH:7][CH2:6][CH2:5]1.[CH3:21][C:22]1[C:30]2[CH2:29][O:28][C:27](=[O:31])[C:26]=2[CH:25]=[CH:24][C:23]=1[C@H:32]1[CH2:34][O:33]1.C(O)C>C(Cl)Cl>[OH:1][C@H:2]([C:10]1[CH:19]=[CH:18][C:13]2[C:14](=[O:17])[O:15][CH2:16][C:12]=2[C:11]=1[CH3:20])[CH2:3][N:4]1[CH2:9][CH2:8][N:7]([CH2:34][C@@H:32]([OH:33])[C:23]2[CH:24]=[CH:25][C:26]3[C:27](=[O:31])[O:28][CH2:29][C:30]=3[C:22]=2[CH3:21])[CH2:6][CH2:5]1

Participants

Conditions

Temperature: 150 °C

Procedure

To a 20 mL microwave tube charged with 5-[(1R)-1-hydroxy-2-piperazin-1-ylethyl]-4-methyl-2-benzofuran-1(3H)-one (166 mg, 0.600 mmol) and a stir bar was added 4-methyl-5-[(2S)-oxiran-2-yl]-2-benzofuran-1(3H)-one (171 mg, 0.900 mmol) and ethanol (10 mL). The mixture was heated in a microwave apparatus to 150° C. for 90 minutes. After the reaction cooled down, DCM (5 mL) was added to the tube. The mixture was allowed to sit at RT overnight. A lot of solids precipitated during that time; these were collected by filtration. Chiral HPLC analysis showed the material was over 95% ee pure 5-((1R)-1-hydroxy-2-{4-[(2S)-2-hydroxy-2-(4-methyl-1-oxo-1,3-dihydro-2-benzofuran-5-yl)ethyl]piperazin-1-yl}ethyl)-4-methyl-2-benzofuran-1(3H)-one. 1H-NMR (500 MHz, DMSO-d6) δ ppm 7.74 (s, 4H), 5.43 (m, 4H), 6.60-5.80 (broad, 2H), 5.33 (s, 2H), 3.40 (broad, 8H), 3.09 (broad, 4H), 2.32 (s, 6H); LCMS M+1 (calc. 467, found 467).

Workup

temperatureAfter the reaction cooled down
customA lot of solids precipitated during that time
filtrationthese were collected by filtration

Sources & evidence

ORD record: ord-fe9af1c476854904914f96d20d0114ce
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08673920B2

Reaction notes

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