Buxbodine B

Steroids. 2015 Mar;95:73-9.

Bioactive steroidal alkaloids from Buxus macowanii Oliv.[Pubmed: 25528196]

METHODS AND RESULTS:
Chemical investigation of the crude methanolic extract of Buxus macowanii resulted in the isolation of five new steroidal alkaloids, 31-hydroxybuxatrienone (1), macowanioxazine (2), 16α-hydroxymacowanitriene (3), macowanitriene (4), macowamine (5), along with five known steroidal bases, Nb-demethylpapillotrienine (6), moenjodaramine (7), irehine (8), Buxbodine B (9) and buxmicrophylline C (10). Structures of compounds 1-10 were elucidated with the aid of spectroscopic methods including 1D and 2D NMR techniques and mass spectrometry. Compounds 1, 3, and 4 belong to a rare class of Buxus alkaloids having Δ(1,2) 9(10→19) abeo triene system.
CONCLUSIONS:
All isolates were evaluated for in vitro acetylcholinesterase (AChE) inhibitory activity and found to exhibit moderate to weak anti-AChE activity with IC50 values in the range of 10.8-98μM. Compounds 1 and 6 were also moderately active in BACE1 inhibitory assay.

Acta Botanica Yunnanica, 2001,23(3):357-62.

Steroidal Alkaloids from Buxus bodinieri[Reference: WebLink]

Five new steroidal alkaloids have been isolated from Buxus bodinieri Lévl.,a common ornamental in South-China.
METHODS AND RESULTS:
On the basis of IR, UV, MS, NMR spectral analyses and chemical evidence, the chemical structure of these new steroidal alkaloids were deduced as: buxbodine A (1)(20α- dimethylamino-9β,19-cyclo-4,4,14α-trimethy-5α-pregnane); Buxbodine B (2)(16β-hydroxy-20α-dimethylamino-9β,19-cyclo-4,4,14α-trimethy-5α-pregn-1(2)-en-3-one); buxbodine C (3)(3β-dimethylamino-9β,19-cyclo-4,4,14α-trimethy-5α-pregn-6(7), 17 (20)-dien-16-one), buxbodine D (4)(3β-dimethylamino-20α-acetoxylamino-9β,19-cyclo -4,4,14α-trimethy-5α-pregn-6(7)-ene) and buxbodine E (5)(3(-dimethylamino-20α-amino -9β,19-cyclo-4,4,14α-trimethy-5α-pregn-6(7)-ene), respectively.