tert-Butyl piperazine-1-carboxylate → 4-[2-Hydroxy-3-(2-methylbenzothiazol-5-yloxy)propyl]-piperazine-1-carboxylic acid tert-butyl ester

HRID 916554Notes

Reaction equation

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

Participants

Conditions

Temperature: 85 °C

Procedure

To 2-methyl-5-(oxiran-2-ylmethoxy) benzothiazole (2.21 g, 10 mmol), a compound of formula (3), was added tert-butyl 1-piperazinecarboxylate (1.86 g, 10 mmol), a compound of formula (4), and ethanol (30 ml). The resulting solution was heated to 85° C. and stirred for 8 hours. The solvent was evaporated under reduced pressure, and the residue was chromatographed on silica gel, eluting with 5% methanol/methylene chloride, to yield 4-[2-hydroxy-3-(2-methylbenzothiazol-5-yloxy)propyl]-piperazine-1-carboxylic acid tert-butyl ester as a clear oil (2.9 g, 7.1 mmol).

Workup

customThe solvent was evaporated under reduced pressure
customthe residue was chromatographed on silica gel
washeluting with 5% methanol/methylene chloride

Sources & evidence

ORD record: ord-674c8a0f923d45ccaafa9ea099019e12
Source dataset: uspto-grants-2007_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07271169B2

Reaction notes

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