Catalytic Enantioselective Synthesis of Cyclobutenes from Alkynes and Alkenyl Derivatives
作者:Mahesh M. Parsutkar、Vinayak Vishnu Pagar、T. V. RajanBabu
DOI:10.1021/jacs.9b07885
日期:2019.9.25
compounds from readily available precursors, using scalable and environmentally benign chemistry, can greatly impact their design, synthesis and eventually manufacture on scale. Functionalized cyclobutanes and cyclobutenes are important structural motifs seen in many bioactive natural products and pharmaceutically relevant small molecules. They are also useful precursors for other classes of organic compounds
使用可扩展且环境友好的化学方法,发现用于从容易获得的前体制备手性化合物的对映选择性催化反应,可以极大地影响它们的设计、合成和最终的规模制造。功能化环丁烷和环丁烯是许多生物活性天然产物和药学相关小分子中的重要结构基序。它们也是其他类别有机化合物的有用前体,例如其他环烷烃衍生物、杂环化合物、立体定义的 1,3-二烯和催化不对称合成的配体。制造环丁烯的最简单方法是通过炔烃和烯基衍生物之间的对映选择性 [2+2]-环加成反应,这种反应历史悠久。然而,给出可接受的对映选择性的此类已知反应的范围非常窄,并且严格限于活化的炔烃和高反应性烯烃。在这里,我们公开了一种广泛适用的对映选择性 [2+2]-环加成反应,在各种炔烃和烯基衍生物(两种最丰富的有机前体类别)之间进行。关键的环加成反应使用衍生自易于合成的配体和地球上丰富的金属钴的催化剂。记录了 50 多种对映选择性在 86-97% ee 范围内的不同
α- and β-Functionalized Ketones from 1,3-Dienes and Aldehydes: Control of Regio- and Enantioselectivity in Hydroacylation of 1,3-Dienes
作者:Mahesh M. Parsutkar、T. V. RajanBabu
DOI:10.1021/jacs.1c06245
日期:2021.8.18
oxidative dimerization mechanism that involves a Co(I)/Co(III) redox cycle that appears to be initiated by a cationic Co(I) intermediate. Studies of reactions using isolated neutral and cationic Co(I) complexes confirm the critical role of the cationic intermediates in these reactions. Enantioselective 1,2-hydroacylation of 2-trimethylsiloxy-1,3-diene reveals a hitherto undisclosed route to chiral siloxy-protected
Preparation of chiral phosphorus, sulfur and selenium containing 2-aryloxazolines
作者:Markus Peer、Johannes C. de Jong、Matthias Kiefer、Thomas Langer、Heiko Rieck、Heico Schell、Peter Sennhenn、Jürgen Sprinz、Henning Steinhagen、Burkhard Wiese、Günter Helmchen
DOI:10.1016/0040-4020(96)00267-0
日期:1996.5
synthetic amino alcohols. For oxazoline formation three procedures were employed: (i) one pot condensation with a 2-halobenzoic acid, (ii) ZnCl2 catalyzed condensation with a 2-halobenzonit-rile, and (iii) a three step sequence via a 2-halobenzamide and a tosylate or chloride. Phosphinooxazolines containing stereogenic phosphorus were prepared by either diastereoselective nucleophilicsubstitution of halogenide
由市售或合成的氨基醇制备一系列对映体纯的2- [2-(二芳基膦基)芳基]-恶唑啉。对于恶唑啉的形成,采用了三种程序:(i)与2-卤代苯甲酸一锅缩合,(ii)ZnCl 2与2-卤代苯甲腈-苯胺催化缩合,和(iii)通过2-卤代苯甲酰胺的三步顺序和甲苯磺酸盐或氯化物。通过非对映选择性亲核取代Ar 1 Ar 2 PC1的卤化物或通过LiPAr 1 Ar 2亲核芳族取代制备含有立体异构磷的膦恶唑啉。另外,制备了硫和硒类似物。
LYSOBACTIN AMIDES
申请人:VON NUSSBAUM Franz
公开号:US20090203582A1
公开(公告)日:2009-08-13
The invention relates to lysobactin amides and methods for their preparation, as well as their use for manufacturing medicaments for the treatment and/or prophylaxis of diseases, in particular bacterial infectious diseases.
ENANTIOSELECTIVE SYNTHESIS OF DIALKYLATED N,O-HETEROCYCLES BY PALLADIUM-CATALYZED ALLYLIC ALKYLATION
申请人:Stoltz Brian M.
公开号:US20160096810A1
公开(公告)日:2016-04-07
This invention provides enantioenriched N,O-heterocyclic compounds with quaternary stereogenic centers and novel methods of preparing the compounds. Methods include the method for the preparation of a compound of formula (I):
comprising treating a compound of formula (II):
with a transition metal catalyst under alkylation conditions.