一、藉由高活性之亞烷基前驅物通過催化型分子內威悌反應合成非那烯[1,2-b]呋喃酮及呋喃[3,2-c]喹啉酮二、透過分子內威悌或𝛽-醯化反應合成二苯並環庚[1,2-b]呋喃酮或酮基官能化亞烷基茚二酮衍生物
No Thumbnail Available
Date
2023
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
第一部分:
我們開發了一個以高活性之亞烷基前驅物做為起始物,、 來進行不需額外添加鹼 之催化型威悌反應。主要概念是加入芳基亞磺酸做為捕獲親核試劑(trapping reagent)來得到 3-芳碸烷基化合物,、 且能夠做在適當的反應條件下釋出穩定的 高活性亞烷基化合物,得以避免產生不必要的[2+1]副產物。
本部分的研究中,我們成功以 3-芳碸烷基非那烯酮及 3-芳碸烷基喹啉酮作為 起始物,並和磷、醯氯作用會合成出非那烯[1,2-b]呋喃酮和呋喃[3,2-b]喹啉酮。、 在優化的過程中,我們也發現可以透過溫度或是添加劑的調控能有助於反應的 進行,且在不需額外加入鹼的條件下及能獲得良好的產率,也進一步的推測: 反應中氧化磷被還原後得到的磷試劑不僅做為親核試劑和亞烷基化合物進行 加成,也做為鹼來推動去質子化的步驟順利地得到威悌產物。隨後我們也陸續 完成一些取代基效應的探討,研究其對電子效應或是立體效應的影響,並得到 更多樣性且結果良好的目標產物。
第二部分:
前半部是以二苯並環庚-5,7-二酮作為起始物,分別透過無鹼之催化行威悌反應 或是以三苯基磷誘導反應來得到二苯並環庚[1,2-b]呋喃酮。開發了兩種方法, 催化條件則能節省試劑的用量、使得反應廢棄物回復到催化循環中繼續反應且 提供了一個更快速有效的合成策略;而誘導條件則是使用非常溫和、容易取得 且價格便宜的三苯基磷也提供了一個更簡易、好上手的合成策略。同時,也發 現此反應取代基耐受性好,也利用控制實驗來探討磷試劑在此反應做為親核試 劑也能作為鹼的功用。後半部分則是發展了以順序的一鍋化合成法,以炔酮先藉由 MBH 合環後,、 再 經由磷誘導的威悌反應或是𝛽-醯化來得到二苯並環庚[1,2-b]呋喃酮或是酮基官 能化亞烷基茚二酮衍生物。透過針對五和七環亞烷基化合物的研究,發現其結 構不同的反應活性,更拓展了這些化合物的合成策略。
Part I : We have developed a base-free catalytic Wittig reaction, using highly reactive alkyl precursors as starting materials. The main concept involves the addition of arylsulfonyl acids as trapping reagents to obtain 3-arylalkylidene compounds. This approach allows the formation of stable and highly reactive alkylated compounds under appropriate reaction conditions, thereby avoiding the formation of unnecessary [2+1] byproducts. Subsequent reaction with phosphine and acyl chlorides leads to the synthesis of phenaleno[1,2-b]furanones and furan[3,2-b]quinolinones. During the optimization process, we found that the reaction without the base could be regulated by temperature or the addition of additives providing in Wittig products. Subsequently, we conducted investigations on the study of the substrate scope, which afford a wide range of expected products.Part II : First, two methods were developed using dibenzocycloheptene-5,7-diones as starting materials. In the first reaction condition (condition A) utilizing a base-free catalytic Wittig reaction offer an efficient synthesis strategy by recycling reagent consumption, and the second reaction condition (condition B) employing triphenylphosphine- induced reaction is mild, these methods successfully obtain dibenzocycloheptene[1,2-b]furanones exhibiting goods functional group tolerance. Second part involves the development of a sequential one-pot synthesis method, where ynones undergo Morita-Baylis-Hillman (MBH) cyclization followed by phosphine-induced Wittig reaction or 𝛽-acylation furnishing dibenzocycloheptene[1,2-b]furanones or keto functionalized alkylidene indandione derivative.
Part I : We have developed a base-free catalytic Wittig reaction, using highly reactive alkyl precursors as starting materials. The main concept involves the addition of arylsulfonyl acids as trapping reagents to obtain 3-arylalkylidene compounds. This approach allows the formation of stable and highly reactive alkylated compounds under appropriate reaction conditions, thereby avoiding the formation of unnecessary [2+1] byproducts. Subsequent reaction with phosphine and acyl chlorides leads to the synthesis of phenaleno[1,2-b]furanones and furan[3,2-b]quinolinones. During the optimization process, we found that the reaction without the base could be regulated by temperature or the addition of additives providing in Wittig products. Subsequently, we conducted investigations on the study of the substrate scope, which afford a wide range of expected products.Part II : First, two methods were developed using dibenzocycloheptene-5,7-diones as starting materials. In the first reaction condition (condition A) utilizing a base-free catalytic Wittig reaction offer an efficient synthesis strategy by recycling reagent consumption, and the second reaction condition (condition B) employing triphenylphosphine- induced reaction is mild, these methods successfully obtain dibenzocycloheptene[1,2-b]furanones exhibiting goods functional group tolerance. Second part involves the development of a sequential one-pot synthesis method, where ynones undergo Morita-Baylis-Hillman (MBH) cyclization followed by phosphine-induced Wittig reaction or 𝛽-acylation furnishing dibenzocycloheptene[1,2-b]furanones or keto functionalized alkylidene indandione derivative.
Description
Keywords
不需額外添加鹼, 催化反應, 威悌反應, 非那烯[1, 2-b]呋喃酮, 呋喃[3, 2-b]喹啉酮, 順序一鍋化合成法, MBH合環反應, 二苯並環庚[1, 2-b]呋喃酮, base-free, catalysis, Wittig reaction, phenaleno[1, 2-b]furanones, furan[3, 2-b]quinolinones, one-pot synthesis, MBH rection, dibenzocyclohepta[1, 2-b]furanones