Enantioselective Addition of Nitromethane to 2-Acylpyridine N-Oxides. Expanding the Generation of Quaternary Stereocenters with the Henry Reaction
摘要:
The direct asymmetric Henry reaction with prochiral ketones, leading to tertiary nitroaldols, is an elusive reaction so far limited to a reduced number of reactive substrates such as trifluoromethyl ketones or alpha-keto carbonyl compounds. Expanding the scope of this important reaction, the direct asymmetric addition of nitromethane to 2-acylpyridine N-oxides catalyzed by a BOX-Cu(II) complex to give the corresponding pyridine-derived tertiary nitroaldols having a quaternary stereogenic center with variable yields and good enantioselectivity, is described.
Rhodium Catalyzed Asymmetric Hydrogenation of 2-Pyridine Ketones
摘要:
Catalyzed by [Rh(COD)Binapine]BF4, the asymmetric hydrogenation of 2-pyridine ketones has been achieved with excellent enantioselectivities (enantiomeric excesses up to 99%) under mild conditions. This method is suitable for various kinds of 2-pyridine ketones and their derivatives. A number of enantiomerically pure chiral 2-pyridine-aryl/alkyl alcohols were prepared through hydrogenation, which can be used directly in organic synthesis.
Perkin communication. Formation of secondary alcohols from the reaction of trimethyl- and methyldiphenyl-telluronium salts with aldehydes by use of organolithium reagents
作者:Li-Lan Shi、Zhang-Lin Zhou、Yao-Zeng Huang
DOI:10.1039/p19900002847
日期:——
The telluronium salts (1) and (2), precursors of the non-stabilized telluroniumylide, on treatment with organolithium reagents, reacted with aldehydes to afford secondary alcohols via tetraorganyl tellurium intermediates.
N-phosphinyl di-and tripeptides as renin inhibitors
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0376040A2
公开(公告)日:1990-07-04
The invention is new renin inhibitor dipeptide and tripeptide derivatives of the formula:
本发明是新的肾素抑制剂二肽和三肽衍生物,其化学式为
PYRIDONE COMPOUND, AND AGRICULTURAL AND HORTICULTURAL FUNGICIDE HAVING THIS AS ACTIVE COMPONENT
申请人:Mitsui Chemicals Agro, Inc.
公开号:EP3611164A1
公开(公告)日:2020-02-19
Novel compounds controlling plant diseases are provided. Pyridone compounds of the invention are novel and can control plant diseases. The pyridone compounds of the invention encompass compounds of formula (1) and salts thereof.
The transition-metal-free aerobic oxidation of benzylic alcohols is uniquely accelerated by a 1-butyl-3-methylimidazolium hexafluorophosphate (BMI-PF(6))/PhCF(3) biphasic system and Cs(2)CO(3) to afford the corresponding ketones in good yields. The reaction system is also applicable to an oxidative cross-esterification of primary benzyl alcohols with a higher aliphatic alcohol. (C) 2011 Elsevier Ltd. All rights reserved.
Chichibabin-Type Direct Alkylation of Pyridyl Alcohols with Alkyl Lithium Reagents
作者:Jenna L. Jeffrey、Richmond Sarpong
DOI:10.1021/ol3024117
日期:2012.11.2
Direct C(6) alkylation of pyridyl alcohols can be achieved following an initial deprotonation of the hydroxy group. This transformation, which is believed to occur by a Chichibabin-type alkylation, avoids lateral deprotonation prior to pyridine ring alkylation and gives increased regioselectivity for C(6) over C(4) alkylation.