Stereochenols A and B, two quinones from Stereospermum chelonoides

Two quinones, stereochenols A ( 1) and B ( 2) were isolated from a methanol extract of the stem bark of Stereospermum chelonoides, in addition to the known naphthoquinones, sterekunthal B ( 3) and sterequinone C ( 4). The structures of these compounds were established by extensive spectroscopic analyses and by comparison of their spectral data with those of related compounds. Two quinones, stereochenols A ( 1) and B ( 2) were isolated from a methanol extract of the stem bark of Stereospermum chelonoides, in addition to the known naphthoquinones, sterekunthal B ( 3) and sterequinone C ( 4). The structures of these compounds were established by extensive spectroscopic analyses and by comparison of their spectral data with those of related compounds.