Lithium butylchalcogenolate induced Michael-aldol tandem sequence: easy and rapid access to highly functionalized organochalcogenides and unsaturated compounds
摘要:
Lithium "butylchalcogenolates are generated in situ by reacting the elements (S, Se, and Te) with (n)butyl-lithium at 0 degrees C. Reaction of the lithium alkylchalcogenolates with activated alkenes and aldehydes gives the corresponding aldol adducts. The selenium-containing products give Morita-Baylis-Hillman adducts after the oxidation/elimination of the selenoxide. The whole sequence can be performed in a one-pot procedure. (C) 2009 Elsevier Ltd. All rights reserved.
DMAP-Catalyzed [3 + 2] and [4 + 2] Cycloaddition Reactions between [60]Fullerene and Unmodified Morita–Baylis–Hillman Adducts in the Presence of Ac<sub>2</sub>O
作者:Hai-Tao Yang、Wen-Long Ren、Chun-Bao Miao、Chun-Ping Dong、Yang Yang、Hai-Tao Xi、Qi Meng、Yan Jiang、Xiao-Qiang Sun
DOI:10.1021/jo3025797
日期:2013.2.1
One-step DMAP-catalyzed [3 + 2] and [4 + 2] cycloaddition reactions between C60 and unmodified Morita–Baylis–Hillman adducts in the presence of Ac2O have been developed for the easy preparation of cyclopentene- and cyclohexene-fused [60]fullerene derivatives. When the MBH adducts bear an alkyl group, two different reaction pathways could be controlled selectively depending on the conditions.
A series of deep eutectic solvents (DESs) based on choline chloride were prepared and used in the Morita–Baylis–Hillman (M–B–H) reaction. Research showed that the composite solvent (1ChCl/2Gly DES–H2O) is a very effective solvent media for all substrates tested. Under the mild reaction conditions, DABCO catalyzed M–B–H reactions proceed very quickly and efficiently. It is particularly important that
The stereoselectivesynthesis of trisubstitutedalkenescontaining a benzyl substituent has been achieved by employing Friedel-Craft reaction of aromatic compounds with unactivated Baylis-Hillmanadducts in the presence of Fe 3 + -K-10 montmorillonite clay as a heterogeneous catalyst. The catalyst can be recovered and reused.
在 Fe 3 + -K-10 蒙脱石粘土作为非均相催化剂存在下,通过使用芳族化合物与未活化的 Baylis-Hillman 加合物的 Friedel-Craft 反应,实现了含有苄基取代基的三取代烯烃的立体选择性合成。催化剂可以回收再利用。