The syntheses of two new ([2,3‐d]‐ and [3,2‐d]‐fused) 2‐cholestenopyrimidines 2 and 5 are described. In their CD spectra, four Cotton effects can be observed, and they have been assigned to an n – π* (B1), π – π* (B2), and to two n – π* (A2) transitions, respectively, from long to short wavelengths. The first two Cotton effects are positive for compounds 2a and 2b, but negative for 5; the third CD is negative, the fourth one positive for all isomers. The methyl group of 2b is of no influence upon the CD.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry