1-茚满酮和1-四氢萘酮与5-硝基糠醛,5-硝基糠醛二乙酸酯,5-硝基噻吩-2-醛,5-硝基噻吩-2-醛二乙酸酯,5-硝基吡咯有衍生物将-2-醛或N-甲基-5-硝基-吡咯-2-醛缩合(8-66,表1)。在由H 3 PO 4引起缩合的情况下,乙酰氨基同时水解,在乙酸酐发生缩合的情况下,同时进行OH基的乙酰化反应(78-83,表2)。 )。描述了在苯核上取代的新的1-茚满酮和1-四氢萘酮衍生物。
Synthesis of substituted tetrahydronaphthalenes by manganese(III), cerium(IV), and iron(III) oxidation of substituted diethyl .alpha.-benzylmalonates in the presence of olefins
摘要:
The oxidation of substituted diethyl alpha-benzylmalonates (1a-m) by manganese(III) acetate in acetic acid, cerium(IV) ammonium nitrate in methanol, or iron(III) perchlorate in acetonitrile in the presence of substituted olefins 2a-u was investigated. The results are consistent with a common mechanism. It involves selective generation of malonyl radicals from high-valent metal malonyl complexes, their addition to the olefin, and competition of the adduct radical between intramolecular cyclization to produce highly functionalized tetrahydronaphthalenes (3) and oxidation by metal salt to give mainly gamma-lactones (5). Several electron-withdrawing and releasing substituents on the aromatic ring and on the olefin can be successfully used in the synthesis of 3 without olefin telomerization. The influence of metal and olefin or aromatic substituents on the homolytic addition and intramolecular aromatic substitution is discussed.
Unnatural α-amino ethyl esters from diethyl malonate or ethyl β-bromo-α-hydroxyiminocarboxylate
作者:Eloi P Coutant、Vincent Hervin、Glwadys Gagnot、Candice Ford、Racha Baatallah、Yves L Janin
DOI:10.3762/bjoc.14.264
日期:——
We have explored here the scope of the age-old diethyl malonate-based accesses to α-aminoesters involving Knoevenagel condensations of diethyl malonate on aldehydes, reductions of the resulting alkylidenemalonates, the preparation of the corresponding α-hydroxyimino esters and their final reduction. This synthetic pathway turned out to be general although some unexpected limitations were encountered
4-Alkyloxyimino Derivatives of Uridine-5′-triphosphate: Distal Modification of Potent Agonists as a Strategy for Molecular Probes of P2Y<sub>2</sub>, P2Y<sub>4</sub>, and P2Y<sub>6</sub> Receptors
作者:P. Suresh Jayasekara、Matthew O. Barrett、Christopher B. Ball、Kyle A. Brown、Eva Hammes、Ramachandran Balasubramanian、T. Kendall Harden、Kenneth A. Jacobson
DOI:10.1021/jm500367e
日期:2014.5.8
Extended N4-(3-arylpropyl)oxy derivatives of uridine-5′-triphosphate were synthesized and potently stimulated phospholipase C stimulation in astrocytoma cells expressing G protein-coupled human (h) P2Y receptors (P2YRs) activated by UTP (P2Y2/4R) or UDP (P2Y6R). The potent P2Y4R-selective N4-(3-phenylpropyl)oxy agonist was phenyl ring-substituted or replaced with terminal heterocyclic or naphthyl rings
Enantioselective Suzuki Cross-Couplings of Unactivated 1-Fluoro-1-haloalkanes: Synthesis of Chiral β-, γ-, δ-, and ε-Fluoroalkanes
作者:Xiaojian Jiang、Mark Gandelman
DOI:10.1021/jacs.5b00473
日期:2015.2.25
general approach to construct β-, γ-, δ-, and ε- fluoroalkanes with good enantioselectivity is described. Different directing groups, such as benzyl, ketone, and sulfonyl, were shown to give good enantioselectivity under Suzuki cross-coupling conditions in the presence of a Ni catalyst and chiral diamine ligand. It includes the first examples of enantioselective synthesis of chiral fluorine-containing
[EN] PYRIMIDINE DERIVATIVES AND USE THEREOF AS AGRICULTURAL AND HORTICULTURAL FUNGICIDES<br/>[FR] DERIVES DE PYRIMIDINE ET UTILISATION DE CEUX-CI COMME FONGICIDES AGRICOLES ET HORTICOLES
申请人:BAYER CROPSCIENCE AG
公开号:WO2005079798A1
公开(公告)日:2005-09-01
An agrohorticultural fungicide characterized by containing benzylpyrimidine derivatives represented by the formula (I) wherein R1 to R6 and Q are as defined in the description.
“Deficient” but “efficient”, the first example of a catalytic Friedel–Craftsalkylation of arenes, carrying electron-withdrawing groups, with alcohols is reported. The optimized iron(III) chloride (97%) catalyzed allylation, benzylation and propargylation procedures open an access to a range of tetrahydronaphthalenes, tetrahydroisoquinolines and tetrahydrobenzo[d]azepines featuring tertiary benzylic
据报道,“有缺陷”但“有效率”是带有醇类的带有吸电子基团的芳烃催化弗里德-克拉夫茨烷基化的第一个例子。经过优化的氯化铁(III)(97%)催化的烯丙基化,苄基化和炔丙基化程序使人们可以使用一系列具有叔苄基立体中心的四氢萘,四氢异喹啉和四氢苯并[ d ]氮杂s烷,产率高(高达92%),反应时间短。时代。