65027-01-2Relevant articles and documents
STRUCTURE OF THE STEROIDAL ALKALOID MULDAMINE AND ITS DEACETYL DERIVATIVE
Gaffield, William,Wong, Rosalind Y.,Lundin, Robert E.,Keeler, Richard F.
, p. 2397 - 2400 (1982)
Spectral techniques have established the structure of muldamine from Veratrum californicum as (22S,25S)-22,26-epiminocholest-5-ene-3β,16α-diol 16-acetate, instead of the C-nor-D-homo steroid structure previously suggested.Its deacetyl derivative seems to be identical with teinemine, the configuration of which at C-22 is therefore S and not R as previously reported.Key Word Index-Veratrum californicum; Liliaceae; steroidal alkaloid; muldamine; (22S,25S)-22,26-epiminocholest-5-ene-3β,16α-diol 16-acetate; deacetylmuldamine; teinemine; isoteinemine.
Partial Synthesis of the Steroid Alkaloids Teinemine, 22-Isoteinemine, Etioline, and 25-Isoetioline
Quyen, Le thi,Ripperger, Helmut,Schreiber, Klaus
, p. 143 - 149 (2007/10/02)
The rare 16α-hydroxylated steroid alkaloids teinemine , 22-isoteinemine , etioline , and 25-isoetioline are synthesized from the abundant spirosolane alkaloids tomatid-5-en-3β-ol and solasodine , respectively.The crucial stages of these syntheses are the conversion of 1 or 15 into the N-protected (22S,25S)-, (22R,25S)-, and (22S,25R) -22,26-epimino-3β-hydroxycholest-5-en-16-ones 6, 7, and 18 as well as their reductions with sodium/2-propanol to the 16α-hydroxy compounds teinemine (8), 22-isoteinemine (10), and (22S,25R)-22,26-epiminocholest-5-ene-3β,16α-diol (19), respectively.By treatment with sodium methanolate the N-chloro derivatives 9 and 11 of 8 and 10 afford etioline (12).In an analogous manner, the N-chloro derivative 20 of 19 is converted into 25-isoetioline (21).