Synthesis of 2,6-disubstituted piperidine alkaloids from ladybird beetles Calvia 10-guttata and Calvia 14-guttata
作者:Peter Kubizna、Ivan Špánik、Jozef Kožíšek、Peter Szolcsányi
DOI:10.1016/j.tet.2010.01.106
日期:2010.3
Optically pure (+)-calvine, (+)-2-epicalvine, (2S,6S)-(6-pentylpiperidin-2-yl)acetic acid methyl ester and (2R,6S)-(6-pentylpiperidin-2-yl)acetic acid methyl ester, four piperidine alkaloids isolated from ladybird beetles of the genus Calvia (Coccinellidae), were synthesised from a common precursor using cyclisative Pd(II)/Cu(II)-catalysed carboamination-(methoxy)carbonylation tandem reaction of alkenylamines
光学纯的(+)-牛磺酸,(+)-2-环氧,(2 S,6 S)-(6-戊基哌啶-2-基)乙酸甲酯和(2 R,6 S)-(6-戊基哌啶) -2-基)乙酸甲酯是使用环化的Pd(II)/ Cu(II)催化的碳氨基化-(甲氧基)羰基化反应从常见的前体合成的,从Calvia(瓢虫)瓢虫中分离得到四种哌啶生物碱烯基胺的串联反应是关键步骤。对(+)-牛磺酸的首次单晶X射线分析证实,其提议的绝对构型为(2 S,6 S)对应于天然产物。