反应详情

A suspension of (E)-3-{4-oxo-spiro[chromane-2,4′-piperidine]-6-yl}-acrylic acid methyl ester hydrochloride (600 mg, 1.78 mmol, Intermediate 1) in DCM (30 ml) was treated with TEA (0.25 ml, 1.77 mmol). The pH was adjusted to 5 with AcOH and then 2-phenylthiazole-4-carbaldehyde (404 mg, 2.13 mmol) and NaBH(OAc)3 (554 mg, 2.62 mmol) were added. The mixture was stirred for 2 h at RT and then partitioned between DCM and aqueous NaHCO3 solution. The organic layer was dried over Na2SO4 and evaporated. The crude residue was purified by column chromatography (eluent: DCM/MeOH 99:1) to give (E)-3-{1′-(2-phenyl-thiazol-4-yl-methyl)-4-oxo-spiro[chromane-2,4′-piperidine]-6-yl}-acrylic acid methyl ester (602 mg).

1. custompartitioned between DCM and aqueous NaHCO3 solution
2. dry with materialThe organic layer was dried over Na2SO4
3. customevaporated
4. customThe crude residue was purified by column chromatography (eluent: DCM/MeOH 99:1)