Photoinduced Palladium-Catalyzed Carbofunctionalization of Conjugated Dienes Proceeding via Radical-Polar Crossover Scenario: 1,2-Aminoalkylation and Beyond
作者:Kelvin Pak Shing Cheung、Daria Kurandina、Tetsuji Yata、Vladimir Gevorgyan
DOI:10.1021/jacs.0c03993
日期:2020.6.3
A photoinduced palladium-catalyzed 1,2-carbofunctionalization of conjugateddienes has been developed. This mild modular approach, which does not require employment of exogeneous photosensitizers and external oxidants, allows for efficient and highly regio- and ste-reoselective synthesis of a broad range of allylic amines from readily available 1,3-dienes, alkyl iodides, and amines. Employment of O-
1,3-Dienes are readily available feedstocks that are widely used in the laboratory and industry. However, the potential of converting 1,3-dienes into value-added products, especially chiral products, has not yet been fully exploited. By synergetic photoredox/copper catalysis, we achieve the first visible-light-induced, enantioselective carbocyanation of 1,3-dienes by using carboxylic acid derivatives
Regio-, Chemo-, and Enantioselective Ni-Catalyzed Hydrocyanation of 1,3-Dienes
作者:Rongrong Yu、Yidan Xing、Xianjie Fang
DOI:10.1021/acs.orglett.0c04133
日期:2021.2.5
A regio-, chemo-, and enantioselective nickel-catalyzed hydrocyanation of 1,3-dienes is reported. The key to the success of this asymmetric transformation is the use of a specific multichiral diphosphite ligand. In addition to aryl-substituted 1,3-dienes, highly challenging aliphatic 1,3-diene substrates can also be preferentially converted to the corresponding 1,2-adducts in decent yields with the
Transition-metal-free synthesis of vicinal triborated compounds and selective functionalisation of the internal C–B bond
作者:Elliot Davenport、Elena Fernandez
DOI:10.1039/c8cc06153j
日期:——
1,2,3-Triborated compounds can be prepared by simple nucleophilic borylation of 1,3-dienes, without the assistance of metal catalysts. Selectivefunctionalisation of the internal C–B bond of the 1,2,3-triborated compounds, through cross-coupling with aryl iodides, highlights the powerful methodology toward polyfunctionalisation.
Enantio- and Diastereoselective Synthesis of Homoallylic α-Trifluoromethyl Amines by Catalytic Hydroalkylation of Dienes
作者:Chibueze I. Onyeagusi、Xinxin Shao、Steven J. Malcolmson
DOI:10.1021/acs.orglett.0c00342
日期:2020.2.21
We describe a strategy for the enantio- and diastereoselectivesynthesis of homoallylic α-trifluoromethyl amines by the catalytic hydroalkylation of terminal dienes. Trifluoromethyl-substituted isatin-derived azadienolate nucleophiles undergo γ-selective alkylation with a Pd-DTBM-SEGPHOS catalyst, which additionally promotes regioselective addition to the diene and delivers products in up to 86% yield
我们描述了通过末端二烯的催化加氢烷基化对映和非对映选择性合成高烯丙基α-三氟甲基胺的策略。三氟甲基取代的靛红衍生的氮杂二烯酸亲核体在 Pd-DTBM-SEGPHOS 催化剂的作用下进行 γ-选择性烷基化,这进一步促进了二烯的区域选择性加成,并以高达 86% 的收率、10:1 dr 和 97.5:2.5 er 生成产物。