Facile synthesis of 2Z-2-Chloromethyl aryl-2-enoates
摘要:
Triethylamine-Methanesulfonyl chloride has been employed as reagent for stereoselective synthesis of 2Z-2-(Chloromethyl)aryl-2-enoates from Baylis Hillman products in good yields at room temperature. (C) 1997 Published by Elsevier Science Ltd.
1-脯氨酸已经在刚性线性配体H 4 L中共价连接,所述刚性线性配体H 4 L在每个末端具有间苯二甲酸酯部分以形成手性配体H 4 LPRO。该连接体已用于构建多孔MOF L Cu PRO。自由升在咪唑存在作为助催化剂功能的框架的空腔-脯氨酸部分协同催化α,β不饱和羰基化合物和芳族醛类之间的的Baylis-Hillman反应。氮吸附等温线证明了骨架的高孔隙率。
New CC Bond Formation via Nonstoichiometric Titanium(IV) Halide Mediated Vicinal Difunctionalization of α,β-Unsaturated Acyclic Ketones
作者:Guigen Li、Joe Gao、Han-Xun Wei、Mason Enright
DOI:10.1021/ol9904040
日期:2000.3.1
[reaction: see text] Highly stereoselective vicinal difuctionalization of alpha,beta-unsaturated ketones for the synthesis of multifunctionalized trisubstituted alkenes is described. The new reaction employs titanium(IV) halides (0.5 equiv) as promoters and inexpensive commercial chemicals as starting materials. The reaction can be performed at room temperature in a convenient vial without the protection
Dynamic Covalent Organocatalysts Discovered from Catalytic Systems through Rapid Deconvolution Screening
作者:Fredrik Schaufelberger、Olof Ramström
DOI:10.1002/chem.201502088
日期:2015.9.1
The first example of a bifunctional organocatalyst assembled throughdynamiccovalent chemistry (DCC) is described. The catalyst is based on reversible imine chemistry and can catalyze the Morita–Baylis–Hillman (MBH) reaction of enones with aldehydes or N‐tosyl imines. Furthermore, these dynamic catalysts were shown to be optimizable through a systemic screening approach, in which large mixtures of
First Evidence of Proline Acting as a Bifunctional Catalyst in the Baylis–Hillman Reaction Between Alkyl Vinyl Ketones and Aryl Aldehydes
作者:Michelangelo Gruttadauria、Francesco Giacalone、Paolo Lo Meo、Adriana Mossuto Marculescu、Serena Riela、Renato Noto
DOI:10.1002/ejoc.200701112
日期:2008.3
Proline in the presence of sodium hydrogen carbonate has been found to be an effective catalyst for the Baylis–Hillman reaction between methyl or ethylvinyl ketone and aryl aldehydes. Screening of several amine catalysts showed that an ionizable carboxylic function directly linked to the secondary amine catalyst plays an important role in the synthesis of the desired product in good yield. The data
StarchSulfuric Acid (SSA) as Catalyst for a One-Pot Synthesis of 1,5-Diaryl-1<i>H</i>-pyrazoles
作者:Farhad Hatamjafari
DOI:10.1002/hlca.201200621
日期:2013.8
Protocols with starchsulfuricacid (SSA) as reusable catalyst for the synthesis of aryl‐1H‐pyrazoles are described. SSA acted as an efficient and environmentally friendly catalyst for the regioselective condensation of BaylisHillman adducts 1 with phenylhydrazine hydrochloride leading to the new 1,5‐diaryl‐1H‐pyrazole 2a–2e in excellent yields (Scheme and Table 1).
A Green, Reusable and Highly Efficient Heterogeneous Catalyst for the Synthesis of Arylpyrazoles using Nano-Fe2O3
作者:Farhad Hatamjafari
DOI:10.13005/ojc/280120
日期:2012.3.18
Series of some new arylpyrazole derivatives have been synthesized in good yields via one-pot condensation reaction using nano-Fe 2 O 3 as heterogeneouscatalyst.