Ring closure of enaminones via intramolecular electrophilic arylation involving benzyne intermediates and its use in the synthesis of .gamma.-lycoran and related compounds
Intramolecular photochemical arylation of N-substituted enaminones: application to synthesis of heterocyclic compounds
作者:Hideo Iida、Yoshifumi Yuasa、Chihiro Kibayashi
DOI:10.1039/c39780000766
日期:——
3-aminocyclohex-2-enones and 1,2,3,3a,4,5-hexahydro-1-(2-halogeno-4,5-methylenedioxybenzyl)indol-6-ones (10) and (11) underwent photochemical cyclisation to yield the five- to seven-membered heterocyclic compounds (5) and the 3,3a,4,5-tetrahydropyrrolo[3,2,1-de]phenanthridine-1,7-(2H)-dione (13), respectively.
3-氨基环己-2-烯酮和1,2,3,3a,4的N-(2-溴苯基)-,N-(2-溴苄基)-和N-(2-溴苯乙基)-衍生物(3) ,(5-)六氢-1-(2-卤代-4,5-亚甲基二氧基苄基)吲哚-6-(10)和(11)经过光化学环化反应生成五至七元杂环化合物(5)和3 ,3a,4,5-四氢吡咯并[3,2,1- de ]菲啶-1,7-(2H)-二酮(13)。
Synthesis of 1,12b-didehydrolycoran (α-anhydrodihydrocaranine) and 12bα-lycoran (γ-lycoran)via photocyclisation of an enamide-ketone
作者:Hideo Iida、Sakae Aoyagi、Chihiro Kibayashi
DOI:10.1039/p19750002502
日期:——
A novel stereoselective synthesis of lycorine-typealkaloids from a key intermediate obtained by photocyclisation of an enamido-ketone is described. Birch reduction of 6-methoxyindoline, prepared by a benzyne reaction of 3-chloro-4-methoxyphenethylamine, gave 3,3a,4,5-tetrahydro-6-methoxy-2H-indole (18) which reacted with benzoyl and 3,4-methylenedioxybenzoyl chloride to form the corresponding N-acylindol-6-one
描述了一种新的立体选择性合成的lycorine型生物碱从关键中间体通过烯胺酮的光环化获得。通过3-氯-4-甲氧基苯乙胺的苯炔反应制备的6-甲氧基二氢吲哚桦木还原,得到3,3a,4,5-四氢-6-甲氧基-2 H-吲哚(18),其与苯甲酰基和3, 4-亚甲基二氧基苯甲酰氯形成相应的N -acylindol-6-one衍生物(20)和(21)。两种烯胺酮的照射分别产生吡咯并[3,2,1- de ]菲啶衍生物(22)和(23)。在用氢化锂铝处理后,将后者(23)立体选择性地转化为(±)-1,12b-二氢二氢呋喃(3),然后将其氢化为(±)-12bα-二氢呋喃(5)。
A Practical Approach to 6H-Indol-6-ones Enables the Formal Synthesis of γ-Lycorane
作者:Rui Zhan、Li-Dong Shao、Yang Chen、Xin-Ting Hu、Xiao-Yan Xie、Dashan Li、Chun-Xia Zheng、You-Xi Zhang、Wen-Jing Wang
DOI:10.1055/a-1878-8597
日期:2023.1
We represented herein a two-step synthesis of 1-methyl-6H-indol-6-one which is an N-containing 6/5 fused bicyclic buildingblocks in Amaryllidaceae alkaloids. The key step featured is a ‘one-pot’ ozonolysis/reductive amination/cyclization of allylated cyclohexa-1,3-dione to give bicyclic compounds. Moreover, the formal total synthesis of naturalproduct γ-lycorane could be achieved through a photo-promoted
我们在此展示了 1-methyl-6 H -indol-6-one的两步合成,它是石蒜科生物碱中含N的 6/5 稠合双环结构单元。关键步骤是烯丙基化 cyclohexa-1,3-dione 的“一锅”臭氧分解/还原胺化/环化,得到双环化合物。此外,天然产物 γ-lycorane 的正式全合成可以通过所得双环中间体的光促进环化/氧化级联反应来实现。
Exploitation of intramolecular photochemical arylation of N-substituted enaminones. Efficient, general synthesis of heterocyclic compounds
作者:Hideo Iida、Yoshifumi Yuasa、Chihiro Kibayashi
DOI:10.1021/jo01322a009
日期:1979.4
Iida,H. et al., Heterocycles, 1977, vol. 6, p. 1747 - 1751