Phosgene → HCID 20143943, compound

Participants

Reaction Steps

A suspension of 7.4 g of the product from Example 15 and 0.1 g of 1,4-diazabicyclo[2.2.2]octane in 100 ml xylenes was heated to reflux temperature. To this solution was added 1.5 ml of phosgene at a rate that maintained the temperature above 130°. When the addition was complete, the turbid solution was heated at reflux temperature for about one hour, allowed to cool, and then filtered under an atmosphere of nitrogen. Removal of the solvent from the filtrate gave the product as a dark oil which was dissolved in dry methylene chloride and carried on to the next step without purification. The infrared spectrum of this intermediate displayed a characteristic isocyanate absorption at 2240 cm-1.

Provenance & Evidence