Promorphine alkaloids

Alkaloids of the / -quinonoid-aporphine (IX.1-IX.3) type are present in H. sonora L. (32), while the morphinane (X.1-X.2) type, also known as promorphine alkaloids, occurs only in H. voyronii Jum. (S,9). These alkaloids did not inhibit platelet aggregation in vitro induced by thrombin, arachidonic acid, collagen, and PAF (32) (Table II). 

The morphinan alkaloids, also known as promorphine alkaloids, are present in the family Menispermaceae in 63 (4.1%) examples. They differ from those present in the family Papaveraceae in not having the ether bridge between the carbons C-4 and C-5. With the exception of cephasamine (571), the only alkaloid having the above bridge. 

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