SYNTHESIS, STRUCTURE AND USE OF BISOXAZOLIDINES FOR ASYMMETRIC CATALYSIS AND SYNTHESIS
申请人:Wolf Christian
公开号:US20070265255A1
公开(公告)日:2007-11-15
One aspect of the invention relates to chiral bisoxazolidines and their use in asymmetric catalysis. The chiral bisoxazolidines are a novel class of compounds that is expected to find multiple applications, for example, in asymmetric synthesis. For example, a bisoxazolidine ligand enabled the catalytic enantioselective alkynylation and alkylation of a range of aromatic and aliphatic aldehydes, generating chiral propargylic alcohols and secondary alcohols in high yields and enantiomeric excess.
Brønsted Acid Catalyzed Propargylation of 1,3-Dicarbonyl Derivatives. Synthesis of Tetrasubstituted Furans
作者:Roberto Sanz、Delia Miguel、Alberto Martínez、Julia M. Álvarez-Gutiérrez、Félix Rodríguez
DOI:10.1021/ol0631298
日期:2007.2.1
Bronsted acids such as p-toluenesulfonic acid monohydrate (PTS) efficientlycatalyze a direct substitution of the hydroxyl group in propargylic alcohols with 1,3-dicarbonylcompounds. Selective propargylation or allenylation is obtained depending on the nature of the alkynol. Reactions can be performed in air in undried solvents with water being the only side product of the process. By applying this reaction
Catalytic enantioselective addition of terminal alkynes to aromatic aldehydes using zinc-hydroxyamide complexes
作者:Gonzalo Blay、Luz Cardona、Isabel Fernández、Alícia Marco-Aleixandre、M. Carmen Muñoz、José R. Pedro
DOI:10.1039/b911592g
日期:——
A mandelamide ligand, derived from (S)-mandelic acid and (S)-phenylethanamine, catalyzes the addition of aryl-, alkyl- and silyl-alkynylzinc reagents to aromatic and heteroaromatic aldehydes with good yields and good to high enantioselectivities.
Regioselective Access to Structurally Diverse Coumarin Analogues through Iron-Catalysed Annulation Reactions
作者:Qiao Ren、Jie Kang、Muyao Li、Lujiang Yuan、Ruoyun Chen、Lei Wang
DOI:10.1002/ejoc.201700999
日期:2017.10.10
A highly efficient iron-catalysed propargylation/alkyne oxacyclization/isomerization strategy is described. Biologically active furo[3,2-c]coumarins and pyrano[3,2-c]coumarins are expeditiously assembled with high regioselectivities.
描述了一种高效的铁催化的炔丙基化/炔基羰基化/异构化策略。具有高区域选择性的生物活性呋喃[3,2- c ]香豆素和吡喃并[3,2- c ]香豆素被迅速组装。
Stitching Ynones with Nitromethanes: Domino Synthesis of Functionally Enriched Benzofurans and Benzothiophenes
This benzannulation was also explored with furan/thiophene based o-halo ynones wherein a Michael addition-SNAr process operates and nitromethanes leave their imprint to deliver nitro substituted benzo-furans and -thiophenes.
已发现区域异构的 2-或 3-取代呋喃和噻吩炔酮与一系列硝基甲烷的方便的一锅苯并环化可直接获得密集且多样化的功能化苯并呋喃和苯并噻吩。在该协议中,硝基甲烷中的硝基作为递归碳负离子活化剂来设置串联迈克尔加成-6π-电环化,其最终的牺牲消除促进了芳构化和整体苯环化。还使用基于呋喃/噻吩的邻卤炔酮对这种苯环化进行了探索,其中迈克尔加成-S N Ar 过程运行,硝基甲烷留下它们的印记以提供硝基取代的苯并呋喃和噻吩。