a novel approach to high value-added β-azidoalcohols, which are useful precursors of aziridines, β-aminoalcohols, and other important N- and O-containing heterocyclic compounds. This chemistry also provides an unexpected approach to azido substituted cyclic peroxy alcohol esters. A DFT calculation indicates that Mn catalyst plays key dual roles as an efficient catalyst for the generation of azido
已开发出一种用于合成 β-叠氮醇的高效锰催化的烯烃有氧氧化羟基叠氮化反应。公开了以空气为末端氧化剂的叠氮自由基的有氧氧化生成是该转化的关键过程。该反应以其广泛的底物范围、廉价的锰催化剂、高效率、在空气中容易操作以及室温下温和的条件而受到赞赏。这种化学反应为高附加值的 β-叠氮醇提供了一种新方法,它是氮丙啶、β-氨基醇和其他重要的含 N 和 O 杂环化合物的有用前体。这种化学反应还为叠氮取代的环状过氧醇酯提供了一种意想不到的方法。DFT 计算表明,Mn 催化剂作为产生叠氮自由基的有效催化剂和过氧自由基中间体的稳定剂起着关键的双重作用。进一步的计算合理地解释了所提出的控制 CC 键断裂或形成 β-叠氮醇的机制。
Copper−Carbene Complexes as Catalysts in the Synthesis of Functionalized Styrenes and Aliphatic Alkenes
作者:Hélène Lebel、Michaël Davi、Silvia Díez-González、Steven P. Nolan
DOI:10.1021/jo061781a
日期:2007.1.1
2-propanol. The copper catalysts are not only inexpensive compared to rhodium complexes, but they also exhibit better functional group compatibility with aromatic aldehydes and ketones. Indeed very high yields were obtained for the formation of styrenes containing nitro, trifluoromethyl, amino, and ester groups, as well as for pyridine-, pyrrole-, and indole-substituted alkenes.
Titanium-Catalyzed Intermolecular Hydroaminoalkylation of Conjugated Dienes
作者:Till Preuß、Wolfgang Saak、Sven Doye
DOI:10.1002/chem.201203693
日期:2013.3.18
Ti me kangaroo down: Conjugateddienes undergo intermolecularhydroaminoalkylation in the presence of Ti catalyst [Ind2TiMe2] (Ind=η5‐indenyl). This new reaction offers a highly atom‐efficient approach to homoallylic amines from 1,3‐butadienes.
Iridium-catalysed branched-selective hydroacylation of 1,3-dienes with salicylaldehydes
作者:Yang Yang、Dong Xing
DOI:10.1039/d1cc01872h
日期:——
salicylaldehydes undermildconditions with no need of phosphine ligands. With this protocol, a series of α-branched β,γ-unsaturated o-hydroxyacetophenones with biological potentials were synthesized in high efficiency with excellent regioselectivities. When simple 1,3-butadiene or isoprene instead of 1-aryl 1,3-dienes were used, exclusive linear-selective hydroacylation products were obtained.
construction of enantioenriched 2,3-substituted-1-benzazepine derivatives containing a cyclic tertiary amine moiety was developed by copper-catalyzed reductive intramolecular cyclization of (E)-dienyl arenes with a tethered ketimine. This protocol involves tandem chemo-, regio-, and enantioselective hydrocupration and asymmetric cyclization in the presence of a chiral bisphosphine-copper catalyst. Under