E-Homolupane Derivatives Substituted in Position 17 and 22a. <sup>1</sup>H NMR, <sup>13</sup>C NMR and IR Spectra

Křeček, Václav; Hilgard, Stanislav; Buděšínský, Miloš; Vystrčil, Alois

doi:10.1135/cccc19950619

CCCC > Archive > 1995, Volume 60 > Issue 4 > p. 619

E-Homolupane Derivatives Substituted in Position 17 and 22a. ¹H NMR, ¹³C NMR and IR Spectra

Václav Křeček^a, Stanislav Hilgard^a, Miloš Buděšínský^b and Alois Vystrčil^a

^a Department of Organic Chemistry, Charles University, 128 40 Prague 2, Czech Republic
^b Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic

Abstract

A series of derivatives with various oxygen functionalities in positions 17,22a or 19,20 was prepared from diene I and olefin XVI by addition and oxidation reactions. The structure of the obtained compounds was confirmed by ¹H NMR, ¹³C NMR and IR spectroscopy. The kind of intramolecular association of the 17α-hydroxy group was studied in connection with modification of the side chain and substitution in position 22a. Complete assignment of the hydrogen signals and most of the coupling constants was accomplished using a combination of 1D and 2D NMR techniques. The ¹H and ¹³C NMR spectra are discussed.

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E-Homolupane Derivatives Substituted in Position 17 and 22a. 1H NMR, 13C NMR and IR Spectra

Abstract

E-Homolupane Derivatives Substituted in Position 17 and 22a. ¹H NMR, ¹³C NMR and IR Spectra