Demonstrates the synthesis of 19β,28-epoxy-A-neo-18α-olean-3(5)-ene, suggesting potential applications in chemistry.
The regioselective synthesis of the 19β,28-epoxy-A-neo-18α-olean-3(5)-ene isomer - a product of the tandem rearrangement of betulin under the action of 3,5-dinitrobenzoic acid - is reported. The single crystal X-ray diffraction analysis is used to determine the crystal structure of 19β,28-epoxy-A-neo-18α-olean-3(5)-ene. It is found that the isomer crystallizes in the orthorhombic crystal system, space group P212121. The unit cell parameters are as follows: a = 6.5380(4) Å, b = 15.4381(10) Å, c = 24.7932(15) Å, V = 2502.5(3) Å3.
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Zaytsev et al. (2026) studied this question.
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