Enantioselective Boronate Additions to N-Acyl Quinoliniums Catalyzed by Tartaric Acid
摘要:
Tartaric acid catalyzes the asymmetric addition of vinylboronates to N-acyl quinoliniums, affording highly enantioenriched dihydroquinolines. The catalyst serves to activate the boronate through a ligand-exchange reaction and generates the N-acyl quinolinium in situ from the stable quinoline-derived N,O-acetal.
One-Pot Homologation of Boronic Acids: A Platform for Diversity-Oriented Synthesis
摘要:
Formal homologation of sp(2)-hybridized boronic acids is achieved via cross-coupling of boronic acids with conjunctive haloaryl BMIDA components in the presence of a suitably balanced basic phase. The utility of this approach to provide a platform for diversity-oriented synthesis in discovery medicinal chemistry is demonstrated in the context of the synthesis of a series of analogues of a BET bromodomain inhibitor.
Synthesis of Aldehydes by Organocatalytic Formylation Reactions of Boronic Acids with Glyoxylic Acid
作者:He Huang、Chenguang Yu、Xiangmin Li、Yongqiang Zhang、Yueteng Zhang、Xiaobei Chen、Patrick S. Mariano、Hexin Xie、Wei Wang
DOI:10.1002/anie.201703127
日期:2017.7.3
Reported herein is a conceptually novel organocatalytic strategy for the formylation of boronic acids. New reactivity is engineered into the α‐amino‐acid‐forming Petasis reaction occurring between aryl boronic acids, amines, and glyoxylic acids to prepare aldehydes. The operational simplicity of the process and its ability to generate structurally diverse and valued aryl, heteroaryl, and α,β‐unsaturated
Organocatalytic Enantio- and Diastereoselective Synthesis of 1,2-Dihydronaphthalenes from Isobenzopyrylium Ions
作者:Hui Qian、Wanxiang Zhao、Zhaobin Wang、Jianwei Sun
DOI:10.1021/ja509824j
日期:2015.1.21
efficient asymmetricsynthesis of dihydronaphthalenes is disclosed. The process represents a new addition to the limited asymmetricreactions of isobenzopyryliums, a family of versatile 10π-electron aromatic species. Excellent asymmetric induction is achieved for the first time without an anchoring group in the 4-position or a metal catalyst, both of which were required previously in these reactions. The
Asymmetric Petasis Reactions Catalyzed by Chiral Biphenols
作者:Sha Lou、Scott E. Schaus
DOI:10.1021/ja8018934
日期:2008.6.1
Chiralbiphenolscatalyze the enantioselective Petasis reaction of alkenyl boronates, secondary amines, and ethyl glyoxylate. The reaction requires the use of 15 mol % of (S)-VAPOL as the catalyst, alkenyl boronates as nucleophiles, ethyl glyoxylate as the aldehyde component, and 3 A molecular sieves as an additive. The chiral alpha-amino ester products are obtained in good yields (71-92%) and high
Stereospecific Photoredox‐Catalyzed Vinylations to Functionalized Alkenes and C‐Glycosides
作者:Kumar Bhaskar Pal、Ester Maria Di Tommaso、A. Ken Inge、Berit Olofsson
DOI:10.1002/anie.202301368
日期:——
photo-catalyzed, transition-metal-free C−C cross-coupling reaction has been developed with 4-alkyl-dihydropyridines (DHPs) and vinylbenziodoxol(on)es (VBX, VBO) to synthesize di- and trisubstituted alkenes with complete E : Z selectivity. A diastereoselective C-vinylation of glycosides was also developed. Preliminary mechanistic studies indicate a concerted radical coupling pathway.