Studies on the Chemical Constituents of Rutaceous Plants. L. Development of a Versatile Method for the Synthesis of Antitumor-Active Benzo [c] phenanthridine Alkaloids. (2). Preparation of 2-Aryl-1-tetralone Derivatives

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The synthetic pathway from 2,4-bisaryl-4-oxobutyramide (3) to 2-aryl-1-tetralone (4), which is the key intermediate in the Robinson synthesis of antitumor-active benzo [c] phenanthridine alkaloids was improved. Treatment of the model keto-amide (3a) under the reported basic conditions gave a γ-keto-α, β-unsaturated acid (9) and degradation products. Reduction of the 2,4-bisaryl-4-oxobutyramide (3) with sodium borohydride gave 2,4-bisaryl-4-hydroxybutyramide (16), which could easily be hydrogenolyzed to give 2,4-bisarylbutyramide (15). However, this transformation also tended to give a γ-lactam derivative (17), unfortunately. We succeeded in the direct hydrogenolysis of the 2,4-bisaryl-4-oxobutyramide (3) to the 2,4-bisarylbutyramide (15), which could be hydrolyzed to the corresponding acid (5) without difficulty. The direct hydrolysis of the 2,4-bisaryl-4-oxobutyronitrile (2) to the 2,4-bisaryl-4-oxobutyric acid (6) as reported by Cheng et al. was also examined. Ten 2-aryl-1-tetralones (4) required as starting materials for syntheses of various benzo [c] phenanthridine alkaloids were prepared.
社団法人日本薬学会の論文
1983-09-25