论文部分内容阅读
(+)-Frutescone A (1) and B (2),two novel myrcene-conjugated polymethylated phloroglucinols with an unprecedented spiro-[5.5]undecene skeleton,were isolated from the aerial part of Baeckea frutescens.Their structures and absolute configurations were determined by extensive spectroscopic analysis and electronic circular dichroism (ECD) calculation.The plausible biogenetic pathways of 1 and 2 were proposed to involve an hetero-Diels-Alder cycloaddition reaction as the key step,and their biomimetic synthesis was accomplished.