Diisobutylaluminumhydride → Pirquinozol

Participants

Reaction Steps

1.28 g (0.005 mole) of 5,6-dihydro-5-oxopyrazolo-[1,5-c]quinazoline-2-carboxylic acid ethyl ester prepared as described in Example 2A is suspended in 100 ml of dichloromethane and treated with 7.9 ml (0.011 mole) of 20% di-isobutylaluminum hydride (Dibal). The resultant yellow solution is stirred at room temperature for 45 minutes, 2.0 ml (0.003 M) of Dibal solution is added and stirring continued for 17 hours.

Provenance & Evidence