作者:Kalle Rönkkö、Mathias Berner、Reija Jokela、Arto Tolvanen
DOI:10.1002/jhet.5570370520
日期:2000.9
material. Compound 5 was converted in three steps to trans-ester 8. Acid-catalysed epimerization of 8, lithium aluminum hydride reduction of the ester group, tosylation and substitution with cyanide gave the cis-nitrile 12. Acid-induced cyclization of 12 yielded mainly (±)-trans-11-methoxydeethyleburnamonine (13), whereas base-induced cyclization gave (±)-cis-11-methoxydeethyleburnamonine (4).
以6-甲氧基隐叶酸溴化物(5)为起始原料,进行11-甲氧基脱乙基氨氮(4)和(13)的总合成。化合物5转化分三步反式-酯8。酸催化8的差向异构化,氢化铝锂还原酯基,甲苯磺酰化并用氰化物取代,得到顺式腈12。酸诱导的12的环化反应主要产生(±)-反式-11-甲氧基脱乙基烧花碱(13),而碱诱导的环化反应则产生(±)-顺式反应-11-甲氧基脱乙基金枪鱼碱(4)。