Design, synthesis and application of a new type of bifunctional Le-Phos in highly enantioselective γ-addition reactions of N-centered nucleophiles to allenoates
作者:Haile Qiu、Xiaofeng Chen、Junliang Zhang
DOI:10.1039/c9sc04073k
日期:——
A novel class of bifunctional cyclic phosphine catalysts (Le-Phos) is reported, which showed good performances in enantioselective γ-addition reactions of N-centered nucleophiles and allenoates under mild conditions.
The stereoselective synthesis of syn-β-amino propargylic ethers by the addition of racemic lithio 3-(methoxymethoxy)allenylcuprates, and more particularly (cyano) and (mesityl)cuprates, to enantiopure chiral N-tert-butylsulfinylimines is reported. The scope and limitations of the reaction is studied. The usefulness of the methodology for the synthesis of compounds having a syn-1,2-amino alcohol unit
The authors thank the Spanish Ministerio de Ciencia e Innovacion (MICINN) (grant numbers CTQ2007-65218, Consolider Ingenio 2010-CSD-2007-00006 and CTQ2011-24165), the Generalitat Valenciana (PROMETEO/2009/039), the Fondos Europeos para el Desarrollo Regional (FEDER)) and the University of Alicante for financial support.
作者感谢西班牙国家科学与创新部长 (MICINN)(授权号 CTQ2007-65218、Consolider Ingenio 2010-CSD-2007-00006 和 CTQ2011-24165)、Generalitat Valenciana (PROMETEO/2909), el Desarrollo Regional (FEDER)) 和阿利坎特大学的财政支持。
Synthesis of chiral branched allylamines through dual photoredox/nickel catalysis
作者:Mateusz Garbacz、Sebastian Stecko
DOI:10.1039/d1ob01624e
日期:——
photoredox approach and Ni catalysis. The reaction proceeds under mild conditions, under blue light irradiation, and in the presence of an organic dye, 4CzIPN, as a photocatalyst. The scope of suitable reaction partners is broad, including alkyl bromides bearing reactive functionalities (e.g., esters, nitriles, aldehydes, ketones, epoxides) and N-protected allylamines, as well as N-allylated secondary and tertiary
烯丙胺是合成各种天然产物和药物的通用构件。与末端烯丙胺相比,其具有内部立体定义双键的支链同系物的合成方法研究较少。这项工作描述了一种通过将光氧化还原方法和 Ni 催化相结合,将烷基溴与简单的 3-溴烯丙胺交叉偶联来制备烯丙胺的新方法。该反应在温和的条件下,在蓝光照射下,在有机染料 4CzIPN 作为光催化剂的存在下进行。合适的反应伙伴的范围很广,包括带有反应性官能团的烷基溴(例如,酯、腈、醛、酮、环氧化物)和N-保护的烯丙胺,以及N-烯丙基化的仲胺和叔胺和杂环。使用非外消旋起始材料可以快速简单地构建复杂的多功能烯丙胺衍生物,而不会损失对映体纯度。