1,8-Diazabicyclo(5.4.0)undec-7-ene → HCID 91275966, compound

Participants

Reaction Steps

To a solution of tert-butyl (2-mercapto-benzoimidazol-1-yl)-acetate (Intermediate 3-I, 1.31 g, 4.97 mmol) in dry THF (2.6 ml) cooled to 0° C. is added a solution of DBU (756.6 mg, 742.5 μl, 0.47 mmol) in dry THF (1 ml). This yields a paste that is diluted with dry THF (2.5 ml). A solution of (2-bromo-ethyl)-carbamic acid tert-butyl ester (1.17 g, 5.22 mmol) in dry THF (2.6 ml) is then added and the resulting mixture is allowed to stir for 2 h. The solvent is removed under reduced pressure and saturated aqueous KH2PO4 solution (50 ml) is added. The product is extracted with AcOEt (150 ml), the organic phase is washed once with water and once with brine and dried over Na2SO4. The solvent is removed in vacuo and the crude mixture is purified by flash chromatography on silica-gel (AcOEt/heptane, 1:12), yielding the title compound (1.41 g) in 69% as a colourless oil: tR=2.35 min (LC-2), ESI-MS (pos.): m/z 408.27 [M+H]+.

Provenance & Evidence