Direct Access to α,β-Unsaturated γ-Lactams via Palladium-Catalysed Carbonylation of Propargylic Ureas

IF 4.4 2区 化学 Q2 CHEMISTRY, APPLIED
Debora Schiroli, Aleksandr Voronov, Francesco Pancrazzi, Nunzio Iraci, Salvatore Vincenzo Giofré, Beatrice Macchi, Valeria Stefanizzi, Raffaella Mancuso, Bartolo Gabriele, Paolo Pio Mazzeo, Luca Capaldo, Nicola Della Ca'
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引用次数: 0

Abstract

Abstract. Additive carbonylations typically necessitate strong nucleophiles, such as alcohols or amines. In this study, we carbonylated a poorly nucleophilic urea, under oxidant-free conditions. Our straightforward carbonylative strategy enables access to versatile α,β-unsaturated γ-lactams featuring an aminocarbonyl fragment, utilizing readily available propargylic ureas as starting materials. The employment of the PdI2/KI catalytic system allowed complete regioselectivity (5-endo-dig), high functional group tolerance, broad substrate scope as well as operational simplicity (oxidant-free, organic ligand-free and base-free protocol). The synthetic utility of these γ-lactams is showcased through late-stage functionalizations, such as Giese reactions and peptide couplings.
通过钯催化丙炔基脲的羰基化直接获得α、β-不饱和γ-内酰胺
摘要。加成羰基化通常需要强亲核物,如醇或胺。在本研究中,我们在无氧化剂条件下对亲核性较差的脲进行了羰基化反应。我们采用简单直接的羰基化策略,利用容易获得的丙炔基脲作为起始原料,制备出具有氨基羰基片段的多功能α,β-不饱和γ-内酰胺。采用 PdI2/KI 催化体系可实现完全的区域选择性(5-内向-外向)、高官能团耐受性、广泛的底物范围以及操作简便性(无氧化剂、无机配体和无碱方案)。这些 γ-内酰胺通过后期官能化(如吉斯反应和肽偶联)展示了其合成用途。
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来源期刊
Advanced Synthesis & Catalysis
Advanced Synthesis & Catalysis 化学-应用化学
CiteScore
9.40
自引率
7.40%
发文量
447
审稿时长
1.8 months
期刊介绍: Advanced Synthesis & Catalysis (ASC) is the leading primary journal in organic, organometallic, and applied chemistry. The high impact of ASC can be attributed to the unique focus of the journal, which publishes exciting new results from academic and industrial labs on efficient, practical, and environmentally friendly organic synthesis. While homogeneous, heterogeneous, organic, and enzyme catalysis are key technologies to achieve green synthesis, significant contributions to the same goal by synthesis design, reaction techniques, flow chemistry, and continuous processing, multiphase catalysis, green solvents, catalyst immobilization, and recycling, separation science, and process development are also featured in ASC. The Aims and Scope can be found in the Notice to Authors or on the first page of the table of contents in every issue.
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