3-Benzyloxy-4-[1,1,4-trioxo-5-(2-trimethylsilanylethyl)-1,2,5-thiadiazolidin-2-yl]-benzaldehyde → 5-[2-Benzyloxy-4-(hydroxypyridin-2-yl-methyl)-phenyl]1,1-dioxo-2-(2-trimethylsilanylethyl)-1,2,5-thiadiazolidin-3-one

HRID 660809Notes

Reaction equation

[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([CH:14]=[CH:15][C:16]=1[N:17]1[CH2:21][C:20](=[O:22])[N:19]([CH2:23][CH2:24][Si:25]([CH3:28])([CH3:27])[CH3:26])[S:18]1(=[O:30])=[O:29])[CH:12]=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[N:31]1[CH:36]=[CH:35][CH:34]=[CH:33][C:32]=1[Mg]Br>C1COCC1>[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([CH:12]([OH:13])[C:32]2[CH:33]=[CH:34][CH:35]=[CH:36][N:31]=2)[CH:14]=[CH:15][C:16]=1[N:17]1[S:18](=[O:29])(=[O:30])[N:19]([CH2:23][CH2:24][Si:25]([CH3:26])([CH3:27])[CH3:28])[C:20](=[O:22])[CH2:21]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 3-benzyloxy-4-[1,1,4-trioxo-5-(2-trimethylsilanylethyl)-1,2,5-thiadiazolidin-2-yl]-benzaldehyde (Example 81, step B) (75 mg, 0.17 mmol) in anhydrous THF (4 mL) at −78° C. is added dropwise 2-pyridyl magnesium bromide (0.25M in THF, 1.36 mL, 0.34 mmol). The reaction is stirred at −78° C. for 1 h, then is quenched with saturated NH4Cl. The mixture is extracted with EtOAc and the organic phase is dried over MgSO4. The solvent is removed under reduced pressure and the crude material is purified by column chromatography using a gradient of 0-50% EtOAc/hexane to afford the title compound as a colorless oil: (M−H)−=526.

Workup

customis quenched with saturated NH4Cl
extractionThe mixture is extracted with EtOAc
dry with materialthe organic phase is dried over MgSO4
customThe solvent is removed under reduced pressure
customthe crude material is purified by column chromatography

Sources & evidence

ORD record: ord-fb8065d7244c48db97c9eeffd2667551
Source dataset: uspto-grants-2011_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08084448B2

Reaction notes

Loading…