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Protopine-N-oxide, an alkaloid from Bocconia cordata

✍ Scribed by K. Iwasa; M. Okada; N. Takao

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
141 KB
Volume
22
Category
Article
ISSN
0031-9422

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## Abstract An improved synthetic approach to protopines based on the sequential Hofmann elimination, hydroboration and oxidation of __N__‐(arylmethyl)berbinium salts has been designed. By using berberine chloride as the starting material, this sequence of reactions has provided two new nonnatural