Chemical and Pharmaceutical Bulletin p. 1730 - 1735 (1994)
Update date:2022-08-03
Topics: Purification and characterization Optimization and Scale-Up Functionalization of Vitamin K3 Cyclization to Form the Quinazoline Ring Reduction to Obtain Tetrahydrobenzo[g]quinazoline-5,10-dione
Ohta
Hinata
Yamashita
Kawasaki
Jinda
Horie
The reactions of 2-halogenonaphthoquinones (5, 13, 14 and 15) and 2-methyl-1,4-naphthoquinone (20; vitamin K3) with primary and secondary amines were examined. 1,3-Dialkyl-1,2,3,4-tetrahydrobenzo[g]quinazoline-5,10-diones (9) were obtained in moderate yields by treating 20 with formaldehyde in primary amines. A plausible reaction path-way is also presented.
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