The Synthesis and Resolution of ( & ) -Corlumine . 1067 217. The Synthesis and Resolution of (&)-Corlurnine.

2-Methoxy-4', 5-bis(carboxymethyl)diphenyl ether, corresponding to the diphenyl ether moiety of the isotetrandrine structure, was prepared by a Willgerodt reaction with 2-methoxy-4', 5-diacetyldiphenyl ether. The latter and 2-methoxy-4', 5-dicarboxydiphenyl ether were prepared by appropriate Ullmann diphenyl ether syntheses.IV. 2,2', 3-TRIMETHOXY-4', 5-BIS(/3-CARBOXYETHYL)DIPHENYL ETHER AND RELATED COMPOUNDS

In order to extend our knowledge of the influence of chemical constitution upon cytological activity, several nitrogen isologs of chrysene have been prepared. It is now generally agreed that chrysene possesses little, if any, cancerigenic powers (1, 2). On the other hand, it has been observed that chrysene inhibits the growth rate of Jensen and Walker tumors (3). Thus, it will be of interest to ascertain whether inclusion of nitrogen in the chrysene nucleus will enhance the stimulatory or inhibitory powers of chrysene.Kaphth[2, I-j]isoquinoline (2-azachrysene, V) was prepared by the following sequence of operations. 1-Phenanthrenecarboxaldehyde (4) formed a cyanohydrin with difficulty and was therefore converted instead to 1-(&nitrovinyl)-phenanthrene (I) in 85% yield by the action of alkaline nitromethane. Lithium aluminum hydride reduction of the nitrovinyl compound afforded a quantitative yield of 8-(1-phenanthry1)ethylamine (11). An attempt to cyclize the amine directly by the Pictet-Spengler reaction (5) was unsuccessful. Heating the amine with formic acid at 150-160" yielded p-(1-phenanthry1)ethylformamide (111). Of numerous modifications of the Bischler-Napieralski reaction (6) tried, cyclization could be effected only by the action of phosphorus oxychloride and stannic chloride on the amide in refluxing nitrobenzene (7), proceeding in 29% yield. The 3,4-dihydronaphth[2,l-flisoquinoline (IV) obtained in this way was dehydrogenated with palladium-charcoal (8) yielding 34 % of the desired naphth-[2 , 1-j]isoquinoline (V). The over-all yield from phenanthrene was 0.2 %.The synthesis of benzo[c]phenanthridine (5-azachrysene, VII) required 2-phenylnaphthalene as an intermediate. The latter was prepared by the Gomberg reaction (9) in 7 % yield. Nitration of 2-phenylnaphthalene and reduction of the nitro compound afforded 2-phenyl-1-naphthylamine (10). 1-Formamido-2-phenylnaphthalene (VI) was prepared and cyclized to benzo[c]phenanthridine (VII) by the method previously discussed (7). Although this compound has been prepared previously (ll), the method described herein is superior in point of convenience and yield.A compound believed to be quinolino[6,5-f]quinoline (1 ,7-diazachrysene, IX) was prepared from 6-nitro-2-naphthylamine (12) by two separate routes. The nitroamine was reduced catalytically to 2 ~ 6-naphthalenediamine (VIII) (13) in 74% yield. Subjection of the diamine to a double Skraup reaction (14) transformed it into quinolino[6,5-.f]quinoline in 20 % yield. 8-Nitrobenzo[f]quinoline (X), a known compound, was prepared by a Skraup reaction (15) with 6-nitro-

No abstract

Benzo [a]pyrene is one of the most powerful carcinogens known and is considered to be responsible for the cancerigenic properties of coal tar (1). A number of synthetic derivatives of this compound have been prepared and evaluated (2) but few nitrogen isologs have been prepared and examined for carcinogenicity or anticarcinogenicity (3). The present study was undertaken to provide addi-