Metal‐Free Oxidative [5+1] Cyclization of 1,5‐Enynes for the Synthesis of Pyrazine 1‐Oxide
作者:Xiao‐Feng Xia、Mingming Zhao、Wei He、Lianghua Zou、Xinxin San、Dawei Wang
DOI:10.1002/adsc.202000756
日期:2020.9.8
A chemo‐selective nitrosylation of 1,5‐enynes via a sequence of NO radical incorporation and intramolecular radical cyclization was reported. The formation of two C−N bonds and one C−O bond make this [5+1] cycloaddition reaction an efficient approach to synthesize pyrazine 1‐oxides in moderate to good yields. Metal‐free, short reaction time and mild conditions render this strategy more practical, eco‐friendly
[EN] COMPOUNDS AND METHODS FOR HEMATOPOIETIC REGENERATION<br/>[FR] COMPOSÉS ET MÉTHODES DE RÉGÉNÉRATION HÉMATOPOÏÉTIQUE
申请人:UNIV CALIFORNIA
公开号:WO2019108800A1
公开(公告)日:2019-06-06
The invention relates to compounds that promote hematopoietic regeneration. The invention further relates to methods of promoting hematopoietic regeneration using the novel compounds of the invention.
这项发明涉及促进造血再生的化合物。该发明还涉及利用该发明的新化合物促进造血再生的方法。
New synthetic applications of organotin compounds: synthesis of stereodefined 2-iodo-2-alkenones, 2-substituted (E)-2-alkenones and 2-methyl-2-cycloalkenones
作者:Fabio Bellina、Adriano Carpita、Donatella Ciucci、Massimo De Santis、Renzo Rossi
DOI:10.1016/s0040-4020(01)81297-7
日期:1993.5
product, (E)-13f with the compound derivedfrom methyl transfer, (E)-13e. The couplings involving (Z)-8a, (Z)-8b, (Z)-8c and (Z)-8d proceeded with clean retention of stereochemistry, but the Pd-catalyzed reaction between (E)-8c and SnMe4 afforded a stereoisomeric mixture of 13e. On the contrary, the coupling between (E)/(Z)-8b and SnMe4 produced stereoisomerically pure (E)-13c. Two 2-iodo-2-cycloalkenones
Simple and General Procedure for the Synthesis of α,β-Alkynyl Ketones from Nitriles Using Alkynyldimethylaluminum Reagents
作者:Sang-Hyeup Lee、Balaji Korbad
DOI:10.1055/s-0033-1339482
日期:——
the synthesis of α,β-alkynyl ketones from nitriles and alkynyldimethylaluminum reagents, derivedfrom trimethylaluminum and alkynes, is described. This methodology provides access to a wide range of α,β-alkynyl ketones with aliphatic, aromatic, and heteroaromatic substituents in moderate to high yield (53–90%). In the cases of aryl-substituted nitriles, the product can also be obtained as α,β-alkynyl
Pd-Catalyzed Carbonylative Reactions of Aryl Iodides and Alkynyl Carboxylic Acids via Decarboxylative Couplings
作者:Ahbyeol Park、Kyungho Park、Yong Kim、Sunwoo Lee
DOI:10.1021/ol102993y
日期:2011.3.4
carboxylic acids reacted with aryliodides under a CO atmosphere in the presence of a palladium catalyst to produce α,β-alkynyl aryl ketones in good yields. The maximum turnover number was 16 800. The desired carbonylativecoupling was formed from phenyl propiolic acid without any formation of a noncarbonylative coupling product in the absence of CuI. However, the reaction with alkyl-substituted alkynyl