Synthesis of N-Arylisoindolin-1-ones via Pd-Catalyzed Intramolecular Decarbonylative Coupling of N-(2-Bromobenzyl)oxanilic Acid Phenyl Esters
作者:Wei-Min Dai、Yu Zheng、Gongli Yu、Jinlong Wu
DOI:10.1055/s-0029-1219580
日期:2010.4
Ethyl and phenyl oxanilates were readily prepared from N-(2-bromobenzyl)anilines and oxalyl chloride monoethyl and monophenyl esters, respectively. It was found that the ethyl oxanilate survived in the presence of K 2 CO 3 in DMA at 120 °C and underwent an intramolecular direct arylation using Pd(OA C ) 2 -dppf, furnishing the 5,6-dihydrophenanthridine derivative. In contrast, the corresponding phenyl
从 N-(2-溴苄基) 苯胺和草酰氯单乙基酯和单苯基酯,分别很容易制备乙基和苯基草酸酯。发现草胺酸乙酯在 DMA 中存在 K 2 CO 3 时在 120°C 下存活,并使用 Pd(OA C ) 2 -dppf 进行分子内直接芳基化,提供 5,6-二氢菲啶衍生物。相比之下,相应的苯草酰苯酯在 120 °C 的 DMA 中暴露于 K 2 CO 3 时分解,并通过 Pd(OAc) 2 -dppf 催化的分子内脱羰偶联转化为 N-芳基异吲哚啉-1-酮。除了 4-甲氧基取代的草苯二酸苯酯外,其他具有吸电子 (NO 2 , Cl) 和弱给电子 (Me) 取代基的苯草酸苯酯以 43-80% 的产率提供了 N-芳基异吲哚啉-1-酮.
10.1002/chem.202401658
作者:Giovanelli, Riccardo、Monda, Giulia、Kiriakidi, Sofia、Silva López, Carlos、Bertuzzi, Giulio、Bandini, Marco
DOI:10.1002/chem.202401658
日期:——
A new nickel catalyzed cross‐electrophile coupling for accessing γ‐lactams (isoindolinones) as well as γ‐lactones (isobenzofuranones) via carbonylation with CO2 is documented. The protocol exploits the synergistic role of redox‐active Ni(II) complexes and AlCl3 as a CO2 activator/oxygen scavenger, leading to the formation of a wide range of cyclic amides and esters (28 examples) in good to high yields (up to 87%). A dedicated computational investigation revealed the multiple roles played by AlCl3. In particular, the simultaneous transient protection of the pendant amino group of the starting reagents and the formation of the electrophilically activated CO2‐AlCl3 adduct are shown to concur in paving the way for an energetically favorable mechanistic pathway.
A Short Approach to N-Aryl-1,2,3,4-tetrahydroisoquinolines from N-(2-Bromobenzyl)anilines via a Reductive Amination/Palladium-Catalyzed Ethoxyvinylation/Reductive N-Alkylation Sequence
作者:Franz Bracher、Carina Glas、Ricky Wirawan
DOI:10.1055/s-0040-1706002
日期:2021.6
Starting from readily available ortho-brominated aromatic aldehydes and primary aromatic amines, condensation of these building blocks under reductive conditions gives N-aryl 2-bromobenzylamines. The C-3/C-4-unit of the tetrahydroisoquinoline is introduced using commercially available 2-ethoxyvinyl pinacolboronate under Suzuki conditions. Finally, the obtained crude ortho-ethoxyvinyl benzylamines are cyclized