Chuktabrins A and B, Two Novel Limonoids from the Twigs and Leaves of Chukrasia tabularis
Two novel limonoids, chuktabrin A (1), featuring the unique motifs of a 1, 3-dioxolan-2-one
and a 3, 4-dihydro-2 H-pyran, and chuktabrin B (2), possessing an unprecedented polycyclic
skeleton, were isolated from Chukrasia tabularis. The structures of 1 and 2 bearing a
biosynthetically extended C3 and C2 unit at C-15, respectively, were elucidated on the basis
of spectroscopic data, and that of 1 was confirmed by a single-crystal X-ray diffraction.
and a 3, 4-dihydro-2 H-pyran, and chuktabrin B (2), possessing an unprecedented polycyclic
skeleton, were isolated from Chukrasia tabularis. The structures of 1 and 2 bearing a
biosynthetically extended C3 and C2 unit at C-15, respectively, were elucidated on the basis
of spectroscopic data, and that of 1 was confirmed by a single-crystal X-ray diffraction.
Two novel limonoids, chuktabrin A (1), featuring the unique motifs of a 1,3-dioxolan-2-one and a 3,4-dihydro-2H-pyran, and chuktabrin B (2), possessing an unprecedented polycyclic skeleton, were isolated from Chukrasia tabularis. The structures of 1 and 2 bearing a biosynthetically extended C3 and C2 unit at C-15, respectively, were elucidated on the basis of spectroscopic data, and that of 1 was confirmed by a single-crystal X-ray diffraction.
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