Synthesis of α,β-Unsaturated Aldehydes and Methyl Carboxylic Esters from 2-Acetylenic Phenyl Sulfides.
摘要:
2-Alkynylthio benzenes were reduced to 2-Alkenylthio benzenes with diisobutyl aluminum hydride. Mono chlorination of these compounds with sulfuryl chloride and pyridine followed by hydrolysis, in the presence of Cu-II salts, gave alpha,beta-unsaturated aldehydes.2-Alkynylthio benzenes were converted into 2-Alkynyl 1,1-bis thiobenzenes by monochlorination with sulfuryl chloride and pyridine followed by treatment with thiophenol and triethylamine. These substances were then converted to alpha,beta-unsaturated methyl carboxylic esters by way of isomerization with sodium methoxide to the corresponding allene and treatment with hydrochloric acid and methanolysis in the presence of iodine.
[GRAPHICS]Ene-chlorination of olefins by N-chlorosuccinimide is catalyzed by phenylselenenyl chloride. This reaction demonstrates the catalytic conversion of C-H bonds into more reactive C-Cl bonds.
Synthesis of Isoxazoline Derivatives Based on Nitrile Oxide Cycloaddition of Nitroso-Nitro-Enamine
作者:László András Kondacs、Mihály Viktor Pilipecz、Zoltán Mucsi、Barbara Balázs、Tamás Gáti、Miklós Nyerges、András Dancsó、Péter Nemes
DOI:10.1002/ejoc.201500905
日期:2015.11
A new and stable nitroso-nitro-enamine reagent, providing a nitrile oxide 1,3-dipole, has been treated with dipolarophiles in the course of 1,3-dipolar cycloaddition reactions to give a large number of novel isoxazolyl-pyrroline derivatives. Surprisingly, instead of the expected 2-isoxazolyl-dihydropyrrole cycloadducts, dihydropyrrol-3-one oximes were isolated as the main products in most cases. The
A General Approach to Deboronative Radical Chain Reactions with Pinacol Alkylboronic Esters
作者:Emy André‐Joyaux、Andrey Kuzovlev、Nicholas D. C. Tappin、Philippe Renaud
DOI:10.1002/anie.202004012
日期:2020.8.10
suitable substrates. We report their in situ conversion into alkylboronic catechol esters by boron‐transesterification with a substoichiometric amount of catechol methyl borate combined with an array of radical chain processes. This simple one‐pot radical‐chain deboronative method enables the conversion of pinacol boronic esters into iodides, bromides, chlorides, and thioethers. The process is also suitable
[EN] BIODEGRADABLE LIPIDS FOR THE DELIVERY OF ACTIVE AGENTS<br/>[FR] LIPIDES BIODÉGRADABLES POUR L'ADMINISTRATION D'AGENTS ACTIFS
申请人:ALNYLAM PHARMACEUTICALS INC
公开号:WO2013086354A1
公开(公告)日:2013-06-13
The present invention relates to a cationic lipid having one or more biodegradable groups located in a lipidic moiety (e.g., a hydrophobic chain) of the cationic lipid. These cationic lipids may be incorporated into a lipid particle for delivering an active agent, such as a nucleic acid. The invention also relates to lipid particles comprising a neutral lipid, a lipid capable of reducing aggregation, a cationic lipid of the present invention, and optionally, a sterol. The lipid particle may further include a therapeutic agent such as a nucleic acid.
Etude de la reaction chlorocarbene-acetals de cetenes
作者:N. Slougui、G. Rousseau
DOI:10.1016/s0040-4020(01)96366-5
日期:1985.1
The reaction of chloro, chloromethyl and chlorophenyl carbenoids with ketene alkylsilylacetals has been studied. Excellent yields of cyclopropanation were observed and the unstable chlorocyclopropanone acetals formed were thermallyrearranged in high yield into α-substituted α,β-ethylenic esters. This new method for the synthesis of unsaturated esters appeared complementary of the known-ones.
Basic CuCO<sub>3</sub>
/ligand as a new catalyst for 'on water' borylation of Michael acceptors, alkenes and alkynes: application to the efficient asymmetric synthesis of β-alcohol type sitagliptin side chain
作者:Gaj Stavber、Zdenko Časar
DOI:10.1002/aoc.2957
日期:2013.3
The efficient 'on water' β‐borylation using bis(pinacolato)diboron agent was achieved with a newly developed catalytic system based on basic copper carbonate and various ligands. The catalytic system was used for β‐borylation of various Michael acceptors, alkenes and alkynes. The presented methodology was successfully applied to the novel synthesis of β‐alcohol type sitagliptin side chain precursor