Antibacterials. Synthesis and structure-activity studies of 3-aryl-2-oxooxazolidines. 1. The B group
摘要:
The synthesis and structure/activity studies of the effect of varying the "B" group in a series of oxazolidinone antibacterials (I) are described. Two synthetic routes were used: (1) alkylation of aniline with glycidol followed by dialkyl carbonate heterocyclization to afford I (A = H, B = OH), whose arene ring was further elaborated by using electrophilic aromatic substitution methodology; (2) cycloaddition of substituted aryl isocyanates with epoxides to give A and B with a variety of values. I with B = OH or Br were converted to other "B" functionalities by using SN2 methodology. Antibacterial evaluation of compounds I with A = acetyl, isopropyl, methylthio, methylsulfinyl, methylsulfonyl, and sulfonamido and a variety of different "B" groups against Staphylococcus aureus and Enterococcus faecalis concluded that the compounds with B = aminoacyl, and particularly acetamido, were the most active of those examined in each A series, possessing MICs in the range of 0.5-4 micrograms/mL for the most active compounds described.
Chemoselective CaO-Mediated Acylation of Alcohols and Amines in 2-Methyltetrahydrofuran
作者:Vittorio Pace、Pilar Hoyos、Andrés R. Alcántara、Wolfgang Holzer
DOI:10.1002/cssc.201200922
日期:2013.5
Calcium oxide is proposed as an innocuous acid scavenger for the chemoselective synthesis of amide‐ and ester‐type compounds. Although these molecules have wide spread applications in organic and pharmaceutical chemistry, and a large number of routes have been designed for their synthesis, the development of more efficient and environmentally friendly acylation strategies remains an ongoing challenge
A lipase-catalyzed, cascade kineticresolution protocol has been established for the synthesis of 3-phenyloxazolidin-2-one derivatives with up to excellent enantioselectivities (95% ee). Candida antarctica lipase B showed high catalytic activity and stereoselectivity in sequential O- and N-alkoxycarbonylation processes.
Enzyme- and ruthenium-catalyzed dynamic kinetic resolution involving cascade alkoxycarbonylations for asymmetric synthesis of 5-Substituted N-Aryloxazolidinones
作者:Yang Zhang、Sheng Xie、Mingdi Yan、Olof Ramström
DOI:10.1016/j.mcat.2019.03.020
日期:2019.6
Asymmetricsynthesis of N-aryloxazolidinones via dynamickineticresolution was developed. A ruthenium-based catalyst was used in the racemization of β-anilino alcohols, while Candida antarctica lipase B (CAL-B) was applied for two selective alkoxycarbonylations operating in cascade. Various N-aryloxazolidinone derivatives were obtained in high yields and good enantiopurities.
Carbon dioxide-based facile synthesis of cyclic carbamates from amino alcohols
作者:Teemu Niemi、Israel Fernández、Bethany Steadman、Jere K. Mannisto、Timo Repo
DOI:10.1039/c8cc00636a
日期:——
for the synthesis of cyclic carbamatesfromaminoalcohols and carbon dioxide in the presence of an external base and a hydroxyl group activating reagent. Utilizing p-toluenesulfonyl chloride (TsCl), the reaction proceeds under mild conditions, and the approach is fully applicable to the preparation of various high value-added 5- and 6-membered rings as well as bicyclic fused ring carbamates. DFT calculations
我们在本文中报道了在外部碱和羟基活化剂存在下由氨基醇和二氧化碳合成环状氨基甲酸酯的简单通用方法。利用对甲苯磺酰氯(TsCl),该反应在温和的条件下进行,该方法完全适用于制备各种高附加值的5-和6-元环以及双环稠合的氨基甲酸酯。DFT计算和实验结果表明具有高区域选择性,化学选择性和立体选择性的S N 2型反应机理。
Microwave-Assisted Electrostatically Enhanced Phenol-Catalyzed Synthesis of Oxazolidinones
one-component organocatalyst for the atom-economic transformation of epoxides to oxazolidinones under microwave irradiation. Integrating a positively charged center into phenols over a modular one-step preparation gives rise to a bifunctional system with improved acidity and activity, competent in rapid assembly of epoxides and isocyanates under microwave irradiation in a short reaction time (20–60 min)