Nitrone cycloaddition-based entry to the coccinelline alkaloid skeleton: synthesis of (±)-epi-hippodamine
作者:David R. Adams、William Carruthers、Patrick J. Crowley
DOI:10.1039/c39910001261
日期:——
Synthesis of intermediate 13 possessing the perhydropyrido[2,1,6-de]quinolizine skeleton of the coccinelline alkaloids and conversion to epi-hippodamine 20 was accomplished with stereochemicalcontrol arising from a key cycloaddition reaction of nitrone 2 with ethyl hexa-3,5-dienoate.
中间体13的合成具有立体异构体控制,该中间体具有球藻碱生物碱的全氢吡啶并[2,1,6- de ]喹啉嗪骨架,并转化为表-hippodamine 20,该反应是由硝酮2与六乙基-3,5的关键环加成反应引起的。-女主角。
Synthesis of the ladybug defensive agents (±)-hippodamine, (±)-convergine, (±)-hippocasine and (±)-hippocasine oxide