The dicarbonylation of 1,3‐butadiene to adipic acid derivatives offers the potential for a more cost‐efficient and environmentally benign industrial process. However, the complex reaction network of regioisomeric carbonylation and isomerization pathways, make a selective and direct transformation particularly difficult. Here, we report surprising solvent effects on this palladium‐catalysed process
将1,3-丁二烯二羰基化为己二酸衍生物可为更具成本效益和环境友好的工业生产提供潜力。然而,区域异构体羰基化和异构化途径的复杂反应网络使得选择性和直接转化特别困难。在这里,我们报道了在存在1,2-双-二叔丁基膦膦-二甲苯(d t bpx)配体的情况下,钯催化的这一过程产生了令人惊讶的溶剂影响,这些配体允许由1,3-丁二烯,碳形成己二酸酯二酯。一氧化碳和甲醇,在可扩展条件下具有97%的选择性和100%的原子经济性。在最佳条件下,可以以高至极好的收率获得各种1,2-和1,3-二烯的二酯和三酯。
Synthesis of Terminal Allenes via a Copper-Catalyzed Decarboxylative Coupling Reaction of Alkynyl Carboxylic Acids
作者:Jeongah Lim、Jinseop Choi、Han-Sung Kim、In Seon Kim、Kye Chun Nam、Jimin Kim、Sunwoo Lee
DOI:10.1021/acs.joc.5b02361
日期:2016.1.4
Synthesis of terminal allenes via a copper-catalyzeddecarboxylativecoupling reaction was developed. Aryl alkynyl carboxylic acid, paraformaldehyde, and dicyclohexylamine were reacted with CuI (20 mol %) in diglyme at 100 °C for 2 h to produce the terminal allene in moderate to good yields. The method showed good functional group tolerance.
Preparation of (<i>E</i>)-1,3-Enyne Derivatives through Palladium Catalyzed Hydroalkynylation of Allenes
作者:Zhi-Kai Liu、Ying Yang、Zhuang-Ping Zhan
DOI:10.1021/acs.joc.1c02732
日期:2022.1.21
A general and efficient palladium catalyzed hydroalkynylation of allenes was developed to produce synthetically versatile (E)-1,3-enyne derivatives with highregio- and stereoselectivity. This catalytic system proceeded under mild conditions and was compatible with a broad range of substrates, especially for allenes without electron-bias groups. This work further broadens the synthetic potential of
开发了一种通用且有效的钯催化的丙二烯氢化炔基化反应,以生产具有高区域和立体选择性的合成通用 ( E )-1,3-烯炔衍生物。该催化体系在温和条件下进行,并且与广泛的底物相容,特别是对于没有电子偏压基团的丙二烯。这项工作进一步拓宽了这些支架在有机合成和药物化学中的合成潜力。
Enantioselective Synthesis of cis-Fused Cyclooctanoids via Rhodium(I)-Catalyzed [4 + 2 + 2] Cycloadditions
作者:Brendan C. Lainhart、Erik J. Alexanian
DOI:10.1021/acs.orglett.5b00267
日期:2015.3.6
o]-type cycloadditions offer efficient, atom-economical routes to diverse complexcarbocycles. Recently, such transformations have emerged as unique strategies for medium ring carbocyclesynthesis. Despite the important developments in this area, however, highly enantioselective [m + n + o]-type processes accessing medium ring carbocycles have yet to be developed. Herein, a rhodium-catalyzed [4 + 2 + 2]
催化多组分[ m + n + o ]型环加成化合物提供了高效,原子经济的途径,可通往各种复杂的碳环化合物。最近,这种转化已成为中环碳环合成的独特策略。尽管在该领域取得了重要进展,但是,高度对映选择性[ m + n + o进入中环碳环化合物的]型过程尚未开发。在本文中,报道了铑催化的烯丙二烯与丙二烯的[4 + 2 + 2]环加成反应,从而能够直接立体选择性地合成顺式融合的环辛烷类化合物。这些环加成成功地用于各种π组分,并证明了在[4 + 2 + 2]过程中高水平对映选择性的潜力。
Photoredox-Catalyzed α-Aminoalkylcarboxylation of Allenes with CO<sub>2</sub>
作者:Hyungwoo Hahm、Doohyun Baek、Dowon Kim、Seongwook Park、Jeong Yup Ryoo、Sukwon Hong
DOI:10.1021/acs.orglett.1c01011
日期:2021.5.21
The photoredox-catalyzed α-aminoalkylcarboxylation of aryl allenes with CO2 and N,N-dimethylanilines is reported for the first time (26 examples, up to 96% yield). In the case of electron-deficient allenes, good regioselectivity was observed (up to 94:6), exclusively generating kinetic products over thermodynamic products. This protocol is a novel synthetic method for highly functionalized β,γ-unsaturated