Murraya euchrestifolia murrayaquinone

Among other extended quinones, derivatives of carbazolequinone should be mentioned. Such compounds can also be found in nature, and from root bark of Murraya euchrestifolia the following isomeric compounds were isolated (from 900 g of dried bark) murrayaquinone-A (55) (3 mg), murraya-quinone-B (56) (95 mg), murrayaquinone-C (57) (15 mg), and murrayaqui-none-D (58) (5 mg) (83H1267 85CPB4132). From the same plant, pyraya-quinone-A (59) and pyrayaquinone-B (60) have also been isolated in 0.0002... 

A synthesis of the carbazolequinone alkaloid murrayaquinone-B, previously isolated from the root bark of Murraya euchrestifolia, is described and the compound was obtained in 13% yield (88JCS(P1)241). Photolysis of 2-amino-1,4-naphthoquinone afforded the pentacyclic quinone 61 (R = H) and some of its N-substituted derivatives (88TL591). From 2,3-dibromo-5,6-dimethyl-l,4-benzoquinone, ethyl acetoacetate, and pyridine, a derivative of the indoiequinone system related to 65 was prepared (87IJC180). 

---