作者:Tozo Fujii、Shigeyuki Yoshifuji
DOI:10.1016/s0040-4020(01)83119-7
日期:1980.1
6-piperidone 10, the cis- and the trans-2-piperidone isomers 11 were the minor products. The successful conversion of the cis-lactam acid (−)-13 into the trans-lactam acid (+)-21 was effected on the basis of the fact that (±)-13 and (±)-21 are convertible to each other through cis-trans equilibration (13:21 = 33:67) at 180° in 75 min. When this isomerisation step was skipped in the above reaction sequence, the
从cincholoiponponate [(+)- 4 ]的三环酯(-)- 30的合成中,已经开发出一种新的合成方法,可合成(-)-依美汀(1)和相关的Ipecac生物碱。金鸡纳生物碱金鸡宁(7)。涉及的步骤为(+)- 4 →(+)- 8 → 9 → 10 →(-)- 12- →(-)- 13 →(+)- 21 →(+)- 22 → 28 → 29 →(−)- 30。在Hg(OAc)2 -EDTA中氧化氨基醇9至6哌啶酮10,在顺式-和反式-2-哌啶酮的异构体11为次要产物。所述的转换成功的顺式β-内酰胺的酸( - ) - 13到反式β-内酰胺酸(+) - 21被实现的事实的基础上,即(±) - 13和(±) - 21可转换为彼此通过顺式-反式平衡(13:21 = 33:67)在180℃在75分钟。当按上述反应顺序跳过该异构化步骤时,2,3-顺式-三环(+)- 33获得了手性2,3-顺式-metetines的合成前体。