Tetrahydrofuran → 1,1-Dimethylethyl 4-hydroxy-4-(2-thiazolyl)-1-piperidinecarboxylate

HRID 1365443Notes

Reaction equation

HRID 1365443 reaction equation
[S:1]1[CH:5]=[CH:4][N:3]=[CH:2]1.[Li]CCCC.[C:11]([N:18]1[CH2:23][CH2:22][CH2:21][CH2:20][C:19]1=O)([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12].C1C[O:28]CC1>>[C:14]([O:13][C:11]([N:18]1[CH2:23][CH2:22][C:21]([OH:28])([C:2]2[S:1][CH:5]=[CH:4][N:3]=2)[CH2:20][CH2:19]1)=[O:12])([CH3:17])([CH3:16])[CH3:15]

Participants

5

Reactant 4

HCID 8028TetrahydrofuranHCID 9256ThiazoleHCID 7577838tert-Butyl 2-oxopiperidine-1-carboxylateHCID 178418339Butyllithium

Product 1

HCID 574237961,1-Dimethylethyl 4-hydroxy-4-(2-thiazolyl)-1-piperidinecarboxylate

Procedure

To a solution of thiazole (470 mg) in dry THF (10 mL) at −78° C. was added nBuLi (2.5 m in hexanes, 2.21 mL). After 30 minutes BOC-piperidone (1 g) was added and the reaction mixture was gradually warmed to room temperature. After stirring overnight, the reaction mixture was quenched with water, extracted with ethyl acetate, dried (MgSO4) and the solvent removed in vacuo to yield an oil which was purified using flash chromatography to yield 4-hydroxy-4-thiazol-2-yl-piperidine-1-carboxylic acid tert-butyl ester. Cleavage of the BOC group with HCl yielded 4-thiazol-2-yl-piperidin-4-ol.

Workup

  1. customthe reaction mixture was quenched with water
  2. extractionextracted with ethyl acetate
  3. dry with materialdried (MgSO4)
  4. customthe solvent removed in vacuo
  5. customto yield an oil which
  6. customwas purified

Sources & evidence

ORD record
ord-6e97786b0ca94ae78f59a88bb0f7671f
Source dataset
uspto-grants-2011_02
Patent number
US07888352B2

Reaction notes

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