HCID 58922510, compound → HCID 58922475, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 650 mg (1.2 mmol) of the compound of Example 59 in 2.4 ml dimethylformamide are added 1.2 ml (1.2 mmol) of a 1 M solution of tris(dimethylamino)sulfoniumdifluoro(trimethyl)silicate in tetrahydrofuran under argon at 0° C. After stirring the reaction mixture for 15 minutes at 0° C., stirring is continued at room temperature overnight. The reaction mixture is diluted with water and extracted four times with ethyl acetate. The combined organic phases are dried with sodium sulfate and concentrated in vacuo. The residue is purified by preparative HPLC (column: YMC C18 ODS-AQ 250 mm×30 mm, 11 μm; solvent A: acetonitrile, solvent B: water; gradient: 0 min 10% A, 3 min 10% A, 11 min 90% A, 13 min 90% A, 13.2 min 10% A, 15 min 10% A; wavelength: 220 nm; injection volume: ca. 1000 μl and 2000 μl methanol solution; number of injections: 2). The product containing fractions are combined and concentrated in vacuo.

Provenance & Evidence