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On catalytic hydrogenation of Δ 9 -steroids (e.g. 3β-hydroxy-5-methyl-19-nor-5β-androst-9-en-17-one), four isomers were formed: 9α,10α-, 9α,10β-, 9β,10α- and 9β,10β-adducts. The product distribution was affected by the nature of the C-3 substituent. A chair conformation of A, B, and C rings was found in all of the products with the exception of the 9α,10α-adduct whose B ring adopts a twist...
Isoschizogamine was isolated from the twigs of Schizozygia caffaeoides and its structure revised to 10 on the basis of NMR analysis. It is shown to possess as yet undescribed hexacyclic skeleton of N-acyl 1,2,3,4-tetrahydroquinoline type, the nitrogen atom of which is included in an animal moiety.The alkaloid is proposed to originate from schizozygane-type intermediates through oxidation, aziridine...
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