Synthesis of 2-Nitroalcohols by Regioselective Ring Opening of Epoxides with MgSO4/MeOH/NaNO2 System: A Short Synthesis of Immunosuppressive Agent FTY-720
provides polyfunctional phosphines in good yields. Especially attractive is the hydroboration/boron-zinc exchange sequence which allows the conversion of functionalized olefins into polyfunctional phosphines in a one-pot procedure. Several new chiral phosphines have been prepared starting from readily available chiral olefins (terpenes) and their efficiency in asymmetric hydrogenation reactions has been
A number of organozinc reagents was found to react with tetramethylthiuramdisulfide [(Me 2 NCS 2 ) 2 ] giving dithiocarbamates with complete retention of configuration in the case of chiral compounds.
Palladium-Catalyzed Carbonylative Cross-Coupling of Difluoroalkyl Halides with Alkylboranes under 1 atm of CO
作者:Hai-Yang Zhao、Minqi Zhou、Xingang Zhang
DOI:10.1021/acs.orglett.1c03396
日期:2021.12.3
A palladium catalyzed carbonylative cross-coupling of difluoroalkyl halides with alkyl-9-BBN under 1 atm of CO has been developed. The reaction shows broad substrate scope and high functional group tolerance, even toward complex pharmaceuticals, providing a general and straightforward method to access alkyldifluoroalkyl ketones. Preliminary mechanistic studies reveal that a radical pathway is involved
已开发出钯催化的二氟烷基卤化物与烷基-9-BBN 在 1 个大气压的 CO 下的羰基化交叉偶联。该反应显示出广泛的底物范围和高官能团耐受性,甚至对复杂的药物也是如此,为获取烷基二氟烷基酮提供了一种通用且直接的方法。初步的机理研究表明,该反应涉及自由基途径。
[EN] A METHOD FOR THE PREPARATION OF FINGOLIMOD<br/>[FR] PROCÉDÉ DE PRÉPARATION DE FINGOLIMOD
申请人:ZENTIVA KS
公开号:WO2013185740A1
公开(公告)日:2013-12-19
The invention relates to a method of preparation of 2-amino-2-[2-(4-octylphenyl)- ethyl]propane-1,3-diol (I), comprising opening of the aziridine ring of the intermediates (LVI) by the treatment with organometallic compounds, preferably the Grignard reagents (LVII), producing the key intermediates (LVIII) or (LIX). Another object of the invention is use of the compounds (LVIII) and (LIX) for preparation of fingolimod.
Ru-Centered coordination complexes as a new phase transfer catalyst for alkylation of enolates and Michael additions
作者:Dimitrios Tzalis、Paul Knochel
DOI:10.1016/s0040-4039(99)00587-0
日期:1999.5
A novel phasetransfercatalysis based on a Ru(II)-polypyridyl complex 1 allows the fast alkylation of enolates and Michael additions under very mild conditions.