. Biochemical systematics. Biochemical variation; Botany. 158 BIOCHEMICAL SYSTEMATICS H,CO. H2CH2NH2 mescaline ISOQUINOLINE ALKALOIDS This large group of alkaloids may be considered to be deriva- tives of a parent substance, isoquinoline. Like the protoalkaloids they may also be regarded as, potentially, derivatives of pathways con- nected with aromatic amino acid synthesis. isoquinoline The isoquinoline alkaloids range from simple derivatives with a reduced heterocyclic ring and minor substitutions of the benzene ring to very complex alkaloids of the bis-benzylisoquinohne type. The distributi
. Biochemical systematics. Biochemical variation; Botany. 158 BIOCHEMICAL SYSTEMATICS H,CO. H2CH2NH2 mescaline ISOQUINOLINE ALKALOIDS This large group of alkaloids may be considered to be deriva- tives of a parent substance, isoquinoline. Like the protoalkaloids they may also be regarded as, potentially, derivatives of pathways con- nected with aromatic amino acid synthesis. isoquinoline The isoquinoline alkaloids range from simple derivatives with a reduced heterocyclic ring and minor substitutions of the benzene ring to very complex alkaloids of the bis-benzylisoquinohne type. The distribution of this more or less natural class of alkaloids is of con- siderable interest and will be discussed in a following section. The isoquinohne alkaloids are quite characteristic of the Papaveraceae and certain other families. Representatives of the classes of iso- quinoline derivatives are illustrated below: (a) Simple isoquinoline derivatives. NH HO CH3 anhalonidin (b) Benzylisoquinoline derivatives. H3CO. CH2 OCH, H3CO OCH3 papoverin. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Alston, Ralph E; Turner, B. L. (Billie Lee), 1925-. Englewood Cliffs, N. J. , Prentice-Hall
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