Methoxy chelidonine

Accepting Gadamer and Winterfeld s view that this base is a methoxy-chelidonine, von Bruclihausen and Bersch suggested that the methoxyl group was probably at (III, p. 278). 

The 7,8-dimethoxy homophthalic anhydride 52 prepared via lithiation of 2,3-di-methoxy N,N-diethylbenzamide has been used to obtain some phthalide isoquinolines, while the 7,8-methylenedioxy homophthalic anhydride 53 has been used to prepare ( ) chelidonine (58) a benzophenthridine alkaloid... 

Other genera such as Zanthoxylum provided predominantly canidine- and chelidonine-type alkaloids [248]. In addition, these and other genera were found to produce several new structural types feebly basic acridones like melicopine (41) [571, the first canthinone alkaloids including the 5-methoxy 58 and the 4-methylthio (42) 59 derivatives, and several oxazole alkaloids exemplified by halfordine (43) 160]. 

---