Hypervalent iodine catalysis for selective oxidation of Baylis–Hillman adducts via in situ generation of o-iodoxybenzoic acid (IBX) from 2-iodosobenzoic acid (IBA) in the presence of oxone
作者:Raktani Bikshapathi、Parvathaneni Sai Prathima、Vaidya Jayathirtha Rao
DOI:10.1039/c6nj02628a
日期:——
An efficient, environmentally benign, eco-friendly protocol for selectiveoxidation of primary and secondary Baylis–Hillman alcohols to the corresponding carbonyl compounds has been developed. We have demonstrated the catalytic use of o-iodoxybenzoic acid (IBX) generated in situ from 2-iodosobenzoic acid (IBA) in the presence of oxone (2KHSO5·KHSO4·K2SO4) as a co-oxidant. This efficientmethod notably
已经开发出一种有效的,对环境无害的,环境友好的方案,用于将伯利兹和仲伯利兹-希尔曼醇选择性氧化为相应的羰基化合物。我们已经证明了在氧酮(2KHSO 5 ·KHSO 4 ·K 2 SO 4)作为助氧化剂存在下,由2-碘代苯甲酸(IBA)原位生成的邻碘氧苯甲酸(IBX)的催化用途。这种有效的方法尤其可以在不使用任何有毒重金属和直接使用棘手的IBX的情况下更好地提高产量。此外,可以通过还原后处理方便地回收合成的催化剂。
Synthesis of α-Cyanocinnamaldehydes from Acrylonitrile and Benzaldehydes Catalyzed by Pd(OAc)<sub>2</sub>/HPMoV/FeCl<sub>3</sub>/O<sub>2</sub> System
A facile direct synthesis of (E)-α-cyanocinnamaldehydes from acrylonitrile and benzaldehydes is successfully achieved in a mixed solvent of EtOH/AcOH by Pd(OAc)2/HPMoV/FeCl3/O2 catalyst system. The reaction was found to proceed via the cross-aldol condensation of diethyl acetal derived from acrylonitrile with aldehydes.
Benzaldehydes are reacted with cyanoacetaldehyde, for which reaction the cyanoacetaldehyde can be produced from isoxazole in a basic medium. The reaction gives .alpha.-cyanocinnamaldehydes, the hydrogenation of which gives the corresponding dihydrocinnamyl compounds, which can be converted to 2,4-diaminopyrimidines by reaction with guanidine, using various methods.
Regioselectively substituted cellulose esters and films made therefrom
申请人:Eastman Chemical Company
公开号:US10640577B2
公开(公告)日:2020-05-05
Regioselectively substituted cellulose esters having a plurality of pivaloyl substituents and a plurality of aryl-acyl substituents are disclosed along with methods for making the same. Such cellulose esters may be suitable for use in films, such as +A optical films, and/or +C optical films. Optical films prepared employing such cellulose esters have a variety of commercial applications, such as, for example, as compensation films in liquid crystal displays and/or waveplates in creating circular polarized light used in 3-D technology.
Baylis-Hillman chemistry derived four series of new epalrestat analogues were synthesized. Three structural changes are introduced in these 39 new epalrestat analogues synthesized. All compounds were evaluated for their in vitro aldose reductase inhibitory (ALR) activity. Biological activity data indicates that compounds 6, 16, 19, 28 and 29 are potent and the activity is in the range of reference drug, epalrestat. Molecular modelling studies were performed to understand the binding interactions of these active molecules with the ALR protein. Molecular docking data indicates the key interactions of epalrestat were retained in some of the active compounds whereas some new interactions were noticed for other molecules. The modifications introduced on epalrestat have impact for developing a new-type of ALR inhibitor. (C) 2013 Elsevier Masson SAS. All rights reserved.