Guiding the nitrogen nucleophile to the middle: palladium-catalyzed decarboxylative cyclopropanation of 2-alkylidenetrimethylene carbonates with isocyanates
Guiding the nitrogen nucleophile to the middle: palladium-catalyzed decarboxylative cyclopropanation of 2-alkylidenetrimethylene carbonates with isocyanates
Palladium-catalyzed coupling of allylic cyclic carbonates with iodobenzene and hypervalent iodonium salts
作者:Suk-Ku Kang、Kyung-Yun Jung、Chan-Hee Park、Su-Bum Jang
DOI:10.1016/0040-4039(95)01704-l
日期:1995.10
Palladium-catalyzed arylation of allylic cyclic carbonates with iodobenzene in the presence of Pd(OAc), as catalyst afforded the phenyl-substituted allylic alcohols via palladium oxygen β-elimination. However, palladium-catalyzed arylation, alkenylation, and alkynylation of allylic cyclic carbonates with iodonium tetrafluoroborates afforded the phenyl, alkenyl, and alkynyl-substituted allylic cyclic
A general and practical methodology for the preparation of novel vinyl-substituted [60]fullerene-fused tetrahydrofurans/pyrans/quinolines through palladium-catalyzed decarboxylative heterocyclizations of [60]fullerene with vinylethylene/2-alkylidenetrimethylene carbonates and vinyl carbamates was developed. Without additives or ligands, the Pd(PPh3)4-catalyzed transformations undergo decarboxylative
3-nitroindoles enabled using palladium-catalyzed decarboxylative [4 + 2] cycloaddition of either 2-alkylidenetrimethylene carbonates or 2-(hydroxymethyl)-3-arylallyl carbonates has been developed, affording a wide range of indoline-fused tetrahydropyrans in good yields with excellent diastereoselectivities. This reaction features a wide substrate scope and mild conditions and represents the first example of the
已经开发了一种 3-硝基吲哚的脱芳构化工艺,该工艺使用钯催化的 2-亚烷基三亚甲基碳酸酯或 2-(羟甲基)-3-芳基烯丙基碳酸酯的脱羧 [4 + 2] 环加成,在良好的收率和优异的非对映选择性。该反应具有广泛的底物范围和温和的条件,代表了 π-烯丙基钯 1,4-[ O , C ]-偶极物质在缺电子杂芳烃的脱芳环加成中的第一个应用实例。
Enantio‐, Diastereo‐ and Regioselective Synthesis of Chiral Cyclic and Acyclic
<i>gem</i>
‐Difluoromethylenes by Palladium‐Catalyzed [4+2] Cycloaddition
A Pd-catalyzed asymmetric [4+2] cycloaddition between substituted-2-alkylidenetrimethylene carbonates and cyclic or acyclic gem-difluoroalkyl ketones enabled the synthesis of chiral gem-difluoromethylene compounds. A novel phosphoramidite ligand, which contains a bulky 1,1-dinaphthylmethanamino moiety, was the key to providing high yield products with excellent enantio-, diastereo-, and regioselectivity
<scp>Palladium‐Catalyzed</scp> [4+2] and [6+2] Dipolar Cycloadditions for the Construction of Benzo[<i>d</i>]isothiazole 1,<scp>1‐Dioxide</scp> Fused 1,<scp>3‐Oxazinanes</scp> and 1,<scp>3‐Oxazocanes</scp><sup>†</sup>
The Pd-catalyzed dipolar cycloaddition represents a significant synthetic strategy for the construction of useful heterocyclic compounds. This study developed the dipolar [4+2] and [6+2] cycloaddition reactions of benzo[d]isothiazole 1,1-dioxides (BDs) leading to the synthesis of BD-fused 1,3-oxazinane and 1,3-oxazocane derivatives, respectively. In particular, the synthesis of BD-fused 1,3-oxazinanes
Pd 催化的偶极环加成代表了构建有用杂环化合物的重要合成策略。本研究开发了苯并[ d ]异噻唑1,1-二氧化物(BD)的偶极[4+2]和[6+2]环加成反应,从而合成了BD稠合的1,3-恶嗪烷和1,3-分别是恶唑烷衍生物。特别是,BD-稠合 1,3-恶嗪烷的合成表现出区域选择性和对映选择性特征,从而产生具有良好产率、对映选择性和区域选择性(如果适用)的产品。此外,本工作中开发的[6+2]环加成反应代表了基于BDs合成中等大小环化合物的第一个策略。