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New class of steroidal alkaloids from Fritillaria imperialis
M Nadeem Akhtar1, Atta-ur-Rahman, M Iqbal Choudhary
1International Center for Chemical Sciences, H E J Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan.
Phytochemistry
|March 27, 2003
Abstract:
Two members of a new class of C-nor-D-homo steroidal alkaloids, impranine (1). and dihydroimpranine (2). along with a new pyridyl-pregnane-type steroidal alkaloid, fetisinine (3). and a known base, korsevine (4). were isolated from the bulbs of Fritillaria imperialis. The structures of the compounds were established on the basis of spectroscopic techniques and some chemical transformations. Compounds 1 and 2 form a new class of steroidal alkaloids, named as "impranane."