Bis(trimethylsilyl)carbodiimide → HCID 178512058, compound

Participants

Reaction Steps

To a solution of 3-(2′,2′-dimethyl-4-oxospiro[chroman-2,5′-[1,3]dioxane]-6-yl)benzonitrile (155 mg, 0.44 mmol) in anhydrous DCM (10 mL) under N2 atmosphere was added 1 M TiCl4 (in DCM, 0.88 mL, 0.88 mmol) dropwise within 15 min at room temperature. The mixture was stirred for 1 h after the addition. To this mixture was added bis-trimethylsilylcarbodiimide (181 mg, 217 μL 0.97 mmol) dropwise. The resulting mixture was stirred for another 20 h after the addition. The reaction mixture was poured into ice-water (25 g), stirred for 30 min and filtered through a pad of Celite. The separated aqueous phase of the filtrate was extracted with DCM once. The combined organic phases were dried over anhydrous Na2SO4, filtered, and concentrated to give yellowish gel like solid (E)-N-(6-(3-cyanophenyl)-2,2-bis(hydroxymethyl)chroman-4-ylidene)cyanamide (160 mg), which was used in the next step without further purification. MS ESI +ve m/z 374 (M+H)+.

Provenance & Evidence