The single enantiomer title alcohols, useful as ω-side chain precursors for pharmaceutically important prostaglandin analogues were synthesised from the corresponding racemic alcohols by a convenient 4-step sequence. After enzymatic acylation of the alcohol with a vinyl carboxylate, the residual (S)-alcohol in the mixture was converted to the mesylate. Subsequent displacement with the corresponding
Zeolite-catalyzed synthesis of 2,3-unsubstituted benzo[b]furans via the intramolecular cyclization of 2-aryloxyacetaldehyde acetals
作者:Nan Sun、Peng Huang、Yifan Wang、Weimin Mo、Baoxiang Hu、Zhenlu Shen、Xinquan Hu
DOI:10.1016/j.tet.2015.05.029
日期:2015.7
An efficient and environmentally benign heterogeneous catalytic process for the synthesis of 2,3-unsubstituted benzo[b]furans has been established via the intramolecular cyclization of 2-aryloxyacetaldehyde acetals. By utilizing tin-exchanged H-β zeolite (Sn-β) as catalyst, a wide range of functionalized 2,3-unsubstituted benzo[b]furans could be prepared in good to excellent yields. The Sn-β zeolite
通过2-芳氧基乙醛缩醛的分子内环化,已经建立了一种有效的,对环境无害的非均相催化方法,用于合成2,3-未取代的苯并[ b ]呋喃。通过使用锡交换的H-β沸石(Sn-β)作为催化剂,可以以良好或极好的收率制备各种功能化的2,3-未取代的苯并[ b ]呋喃。Sn-β沸石催化剂还在间位取代的2-芳氧基乙醛缩醛的环化上表现出优异的形状选择性,并且优选形成高达97%的区域选择性的6-取代的异构体。而且,Sn-β沸石可以容易地回收和再利用而没有任何明显的活性损失。
5-Benzyloxy-1,3-dioxanes
申请人:FMC Corporation
公开号:US04077982A1
公开(公告)日:1978-03-07
Herbicidal compositions containing compounds of the formula ##STR1## where R.sup.2 is hydrogen, hydrocarbyl or substituted hydrocarbyl radical; R.sup.2a is hydrogen or methyl and R.sup.2 and R.sup.2a may together form a ring; R.sup.5 is hydrogen, alkyl, haloalkyl or cyanoalkyl; R.sup.r is aryl, substituted aryl or heterocyclyl.
作者:João Bosco P. da Silva、Daniela Maria do A.F. Navarro、Aluizio G. da Silva、Geanne K.N. Santos、Kamilla A. Dutra、Diogo Rodrigo Moreira、Mozart N. Ramos、José Wanderlan P. Espíndola、Ana Daura T. de Oliveira、Dalci José Brondani、Ana Cristina L. Leite、Marcelo Zaldini Hernandes、Valéria R.A. Pereira、Lucas F. da Rocha、Maria Carolina A.B. de Castro、Beatriz C. de Oliveira、Que Lan、Kenneth M. Merz
DOI:10.1016/j.ejmech.2015.04.061
日期:2015.7
A set of aryl- and phenoxymethyl-(thio)semicarbazones were synthetized, characterized and biologically evaluated against the larvae of Aedes aegypti (A. aegypti), the vector responsible for diseases like Dengue and Yellow fever. (Q)SAR studies were useful for predicting the activities of the compounds not included to create the QSAR model as well as to predict the features of a new compound with improved activity. Docking studies corroborated experimental evidence of AeSCP-2 as a potential target able to explain the larvicidal properties of its compounds. The trend observed between the in silica Docking scores and the in vitro pLC50 (equals -log LC50, at molar concentration) data indicated that the highest larvicidal compounds, or the compounds with the highest values for pLC50, are usually those with the higher docking scores (i.e., greater in silica affinity for the AeSCP-2 target). Determination of cytotoxicity for these compounds in mammal cells demonstrated that the top larvicide compounds are non-toxic. (C) 2015 Elsevier Masson SAS. All rights reserved.
Noel-Artis; Berge; Fulcrand, European Journal of Medicinal Chemistry, 1985, vol. 20, # 1, p. 25 - 32