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A new hasubanane-type alkaloid=8-demethoxyrunanine=was isolated from Sino-menium acutum and characterized by melting point=HREIMS=1H NMR=and X-ray diffraction analysis.X-ray diffraction reveals that the title compound crystallizes in the orthorhombic system=space group P212121 with a=7.308(1)=b=21.742(5)=c=22.893(4)=V=3637.5(11)3=Z=8=Dx=1.254 g/cm3=F(000)=1472=μ(MoKα)=0.087 mm-1=the final R=0.0438 and wR=0.0575 for 4497 independent reflections with Rint=0.0192 and 2091 observed reflections with I > 2σ(I).Four rings(ring A:one benzene ring=ring B:one hexagon carbon ring in a half-chair conformation=ring C:one hexagon carbon ring with α,β-unsaturated ketone segment(-CR2=CR1-C=O) in a screw-boat conformation=and ring D:one nonplanar tetrahydropyrrole) form a hasubanane-type alkaloid.
A new hasubanane-type alkaloid = 8-demethoxyrunanine = was isolated from Sino-menium acutum and characterized by melting point = HREIMS = 1H NMR = and X-ray diffraction analysis. X-ray diffraction reveals that the title compound crystallizes in the orthorhombic system = space group P212121 with a = 7.308 1 = b = 21.742 5 = c = 22.893 = V = 3637.5 3 = Z = 8 = Dx = 1.254 g / cm3 = F = 1472 = μ (MoKα) = 0.087 mm -1 = the final R = 0.0438 and wR = 0.0575 for 4497 independent reflections with Rint = 0.0192 and 2091 observed reflections with I> 2σ (I) .Four rings (ring A: one benzene ring = ring B: one hexagon carbon ring in a half-chair conformation = ring C: one hexagon carbon ring with α, β-unsaturated ketone segment (-CR2 = CR1- C = O) ring D: one nonplanar tetrahydropyrrole) form a hasubanane-type alkaloid.