Riassunto
La struttura cristallina dellap-iodio anilide della rifamicina Y è stata determinata con metodi tridimensionali a temperatura ambiente. La cella elementare monoclina, gruppo spaziale P21, ha i parametria = 9,49,b = 18,96,c = 15,30 Å,β = 90°48′, e contiene due molecole.
La costituzione e la configurazione della rifamicina Y, C39H47NO15, risultano quindi determinate attraverso lo studio cristallografico della suap-iodio anilide. Anche molte informazioni sulla configurazione della rifamicina Y possono essere tratte dalla configurazione allo stato solido di questo suo derivato.
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References
M. Brufani, W. Fedeli, G. Giacomello andA. Vaciago, Atti Accad. naz. Lincei Rc.40, 548 (1966).
P. Sensi, personal communication.
V. Prelog, Chemotherapia7, 133 (1963).
W. Oppolzer, V. Prelog andP. Sensi, Experientia20, 336 (1964).
J. Leitich, W. Oppolzer andV. Prelog, Experientia20, 343 (1964).
M. Brufani, W. Fedeli, G. Giacomello andA. Vaciago, Chemotherapia7, 145 (1963).
M. Brufani, W. Fedeli, G. Giacomello andA. Vaciago, Atti Accad. naz. Lincei Rc.36, 113 (1964).
M. Brufani, W. Fedeli, G. Giacomello andA. Vaciago, Experientia20, 339 (1964).
J. Leitich, V. Prelog andP. Sensi, Experientia23, 505 (1967).
G. Kartha andD. J. Haas, J. Am. chem. Soc.86, 3630 (1964).
A. McL. Mathienson, Tetrahedron Lett. No. 46, 4137 (1965). We take this opportunity to modify a conformational detail of the structure of rifamycin B as published in 1964; the ‘labels’ C(36) and O(8) should be interchanged in the Table of atomic coordinates and in the Figures 2, 3 and 4 of our 1964 paper in Experientia9, thus obtaining the above mentioned preferred conformation of the ester group also in the case of rifamycin B. This is the only important change in the structure of thep-iodoanilide derivative of rifamycin B found during the final refinement now completed and to be published elsewhere.
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A brief preliminary report on this structure was read at a meeting of the Accademia Nazionale dei Lincei, Rome, on 12th March 19662.