在吲哚里,吡咯并[2,1-的合成Cyclopropenones一个]异喹啉和吲嗪并[8,7- b ]吲哚生物碱
摘要:
吲哚并咪唑天然产物粟精胺的尝试合成导致成功地将环丙烯酮添加到糖衍生的多羟基化环亚胺中,得到吲哚嗪酮产品,但是在粟精胺8a-桥头位置上安装了额外的羟基。这在我们以前对奥曲林和风信子吡咯并核苷天然产物的处理中也观察到。由醛亚胺二氢异喹啉与环丙烯酮反应合成吡咯并[1,2- a ]异喹啉时发生了相同的氧化现象,而酮亚胺基二氢异喹啉则产生了吡咯并[1,2- a]异喹啉,无桥头氧化。这些结果可能对桥头羟基天然产物啶B 1 / B 2,克拉扎霉素A / B和莱顿霉素A / B的起源具有重要意义。用于合成吲哚并[8,7- b ]吲哚的前体环状醛亚胺产生二聚吲哚并[8,7- b ]吲哚,而相应的环状酮亚胺表现出预期并得到吲哚并[8,7- b ]吲哚。与环丙烯酮反应后的核心。
Effective, thermal one-carbon + two-carbon cycloaddition of cyclopropenone ketals with electron-deficient olefins: Cyclopropane formation.
作者:Dale L. Boger、Christine E. Brotherton
DOI:10.1016/s0040-4039(01)91393-0
日期:1984.1
Treatment of olefinsbearing one electron-withdrawingsubstituent with cyclopropenone ketals under mild, thermal conditions provide cyclopropane products.
Thermal, three-carbon + two-atom cycloaddition of cyclopropenone ketals with carbon-heteroatom double bonds: Butenolide, furan, and γ-keto ester preparation.
作者:Dale L. Boger、Christine E. Brotherton、Gunda I. Georg
DOI:10.1016/s0040-4039(01)91394-2
日期:1984.1
A preliminary study of the thermalreaction of cyclopropenone ketals with carbon-heteroatom double bonds is detailed. The reaction with aldehyde and keto carbonyls provide butenolide ortho esters, the product of a formal three-carbon + two-atom cycloaddition of the cyclopropenone ketal across the carbon-oxygen double bond.
A short stereoselective synthesis, from the cycloadduct of 3,3-dimethoxycyclopropene and 4-methyl-2H-pyran-2-one, of the tricyclic aza-oxa-undecane ring present in gelsemicine is reported.
Thermal reactions of cyclopropenone ketals. Key mechanistic features and scope of the cycloaddition reactions of delocalized singlet vinylcarbenes: three-carbon 1,1-/1,3-dipoles