Racemic benzyl 3-(hydroxymethyl)-3-methylpiperazine-1-carboxylate → benzyl 4-(2-hydroxy-2-((S)-3-methyl-1-oxoisochroman-6-yl)ethyl)-3-(hydroxymethyl)-3-methylpiperazine-1-carboxylate

HRID 2175785Notes

Reaction equation

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

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of racemic benzyl 3-(hydroxymethyl)-3-methylpiperazine-1-carboxylate (1.0 g, 3.8 mmol) (prepared as described in US Patent Application Publication No. US2007/0088039A1, Example 10) in EtOH (13 mL) was added (3S)-3-methyl-6-(oxiran-2-yl)isochroman-1-one (773 mg, 3.80 mmol), the resulting mixture was heated at 80° C. for 16 h, the reaction mixture was concentrated to dryness and purified on silica gel to afford the title compound: LC/MS: m/e 469.2 (M+H)+.

Workup

concentrationthe reaction mixture was concentrated to dryness
custompurified on silica gel

Sources & evidence

ORD record: ord-86fc35c647054043b7b4e58fb8498924
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09062070B2

Reaction notes

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