Keywords
aza-A-homosteroids
azidation
cytotoxicity.
isomerism
M06-2X and MP2 calculations
steroids
tetrazoles
X-ray structures
Abstract
A series of new 1’H-tetrazolo[1’,5’-c]-fused 3-aza-A- homosteroids were synthesized by azidation of progesterone, testosterone and hydrocortisone acetate in the presence of silicon tetrachloride. According to NMR spectroscopy and X-ray analysis, two double bond positional isomers (double bond in ring A or in ring B) are formed in various ratios; according to quantum chemical calculations, their energies are close within 0.4 kcal mol-1. Only low cytotoxic activity against Hep-2, MCF-7, HepG2, and Hek293 cell lines was determined in vitro for the compounds obtained.
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