This review covers the chemistry of allobetulin analogs, including their formation by
rearrangement from betulin derivatives, their further derivatisation, their fusion with …

Аннотация В обзоре систематизированы данные по природным источникам бетулина
и методам его выделения. Рассмотрены превращения бетулина и его доступных …

The data on natural sources of betulin and methods of its extraction are systematized in the
review. Transformations of betulin and its available derivatives are considered. The data on …

Germanicane-type triterpenes allobetulin (3) and 28-oxoallobetulin (4) can be obtained by
the Wagner-Meerwein rearrangement of the more available lupane-type triterpenes betulin …

Рассмотрены новые способы интенсификации процессов выделения ценных
экстрактивных веществ из различных видов коры на примерах лиственных и хвойных …

The use of bismuth (III) salts as catalysts for the Wagner-Meerwein rearrangement of lupane
derivatives with expansion of ring E and formation of an additional O-containing ring is …

The literature on the distribution in nature, structural variations, isolation, identification, and
biosynthesis issues of triterpenoids with a five-membered A-ring was reviewed. The …

The concise synthesis, via a stepwise glycosylation approach, of lupeol, betulin and
betulinic acid O-glycosides bearing a chacotriosyl moiety at the C-3 position is described. All …

A variety of oxygen-, nitrogen-, sulfur-, and platinum-containing allobetulin derivatives,
including those with different positions of double bonds in rings A and B, the penta-and …

28-Oxo-allobetulone derivatives that were newly synthesized or prepared earlier by
modification of ring A (3-and 4-pyridylidene, furfurylidene, azepane, lactam, quinolone …