Bis(trimethylsilyl)carbodiimide → HCID 178430619, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 6-bromo-3-methyl-2′,4′,5′,6′-tetrahydrospiro[chroman-2,3′-pyran]-4-one (200 mg, 0.65 mmol) and TiCl4 (864 mg, 4.55 mmol) in anhydrous DCM (8 mL) was heated at 50° C. under microwave for 5 mins. Then bis-trimethylsilylcarbodiimide (360 mg, 1.95 mmol) was added and the mixture was heated at 65° C. for another 1 hr. The reaction mixture was poured into ice-water and extracted with DCM. The combined organic phases were dried over anhydrous Na2SO4, filtered and concentrated to give (E)-N-(6-bromo-3-methyl-2′,4′,5′,6′-tetrahydrospiro[chroman-2,3′-pyran]-4-ylidene)cyanamide (300 mg, crude), which was used in the next step without further purification.

Provenance & Evidence