用浓溶液处理2-(1-羟烷基)丙-2-烯酸甲酯1。用HBr溶液得到(Z)-2-(溴甲基)烷-2-烯酸甲酯2,将其区域选择性地转化成N-取代的甲基(E)-2-(氨甲基)烷-2-烯酸酯3(S N 2反应)并进入ñ取代的甲基2-(1-氨基烷基)丙-2- enoates 4(S ñ 2'反应)。胺对亲核性攻击的区域控制仅通过选择溶剂即可完成,S N 2反应发生在MeCN和S N中。在石油醚中进行2'反应。水解和内酰胺化分别得到β-内酰胺7和8,分别在C(3)处含有外环亚烷基和亚甲基。
method for the preparation of allyl chlorides from Baylis–Hillmanadducts has been developed using triphosgene/pyridine system. This method is best illustrated by its advantages like operational simplicity, excellent yields, short reaction time, simple procedure and stereoselectivity. The preparation of allyl chlorides from Baylis-Hillmanadducts has been described using triphosgene & pyridine system
A highly efficient, multicomponent protocol for the construction of functionalized quinolinopyranpyrazole scaffolds with high stereoselectivity has been developed through the application of a domino reaction. All the quinolinopyranpyrazoles were synthesized under solvent- and catalyst-free conditions and required no work-up or column chromatography.
AN EASY CONVERSION OF THE BAYLIS-HILLMAN ADDUCTS INTO <i>tert-</i>BUTYLDIMETHYLSILYL ETHERS WITH <i>tert-</i>BUTYLDIMETHYLSILYL CHLORIDE AND Li<sub>2</sub>S
作者:Manouchehr Mamaghani、Abed Badrian
DOI:10.1080/10426500490485291
日期:2004.12.1
The hydroxy group of the Baylis-Hillman adducts is protected with the t-butyldimethylsilyl (TBDMS) group using the reaction of adducts 1a–h with tert-butyldimethylsilyl chloride (TBDMSCl) in the presence of lithium sulfide under nearly acidic reaction conditions.
A simple and convenient methodology for the stereoselective construction of 2-benzyl substituted trisubstituted olefins via sulfuric acid catalyzed Fredel-Crafts reaction of benzene with Baylis-Hillmanadducts is described.
A facile tandem construction of C–O and C–C bonds: a novel one-pot transformation of Baylis–Hillman adducts into 2-benzoxepines
作者:Deevi Basavaiah、Duddu S. Sharada、Ainelly Veerendhar
DOI:10.1016/j.tetlet.2004.02.107
日期:2004.4
A facile and one-pot synthesis of 2-benzoxepines, from Baylis–Hillman adducts that is, alkyl 3-aryl-3-hydroxy-2-methylenepropanoates, via treatment with HCHO in the presence of concd H2SO4, involving tandem construction of C–O and C–C bonds via Prins-type and Friedel–Crafts reactions, is described.
的2-benzoxepines一种简便和一锅法合成,从的Baylis-希尔曼加合物即,烷基3-芳基-3-羟基-2- methylenepropanoates,经由处理用HCHO在concd H的存在2 SO 4,涉及串联结构描述了通过Prins型反应和Friedel-Crafts反应的C–O和C–C键。