Abstract
AbstractThe syntheses of two new ring systems, 5α‐cholest‐2‐eno[3,2‐e]‐(6) and 5α‐cholest‐2‐eno[2,3‐e]‐as‐triazine (11) are described. While the reaction of diketone 1 with semicarbazide hydrochloride results selectively in derivatives of 6, S‐methylisothiosemicarbazide under basic conditions affords the other possible ring closure product 11. An unequivocal decision between both types was made by X‐ray analysis of compound 9. Comparison of the UV and CD spectra shows that besides the two absorptions appearing in the UV spectra additional ones can be observed in the CD, which may be assigned to further n – π* or only slightly allowed π – π* transitions.
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