A highly regio- and stereoselective Pd-catalyzed tandem allylic rearrangement/intramolecular decarboxylative coupling of aryl propiolates derived from Baylis–Hillman adducts
A highly regio- and stereoselective Pd-catalyzed tandem allylic rearrangement/intramolecular decarboxylative coupling of aryl propiolates derived from Baylis–Hillman alcohols leading to the formation of an important class of 1,5-diarylpent-1-en-4-ynes has been developed. The aryl propiolates of Baylis–Hillman alcohols derived from methyl acrylate provided exclusively (E)-1,5-diarylpent-1-en-4-ynes
Allylic and Allenic Halide Synthesis via NbCl<sub>5</sub>- and NbBr<sub>5</sub>-Mediated Alkoxide Rearrangements
作者:P. C. Ravikumar、Lihua Yao、Fraser F. Fleming
DOI:10.1021/jo901287f
日期:2009.10.2
Addition of NbCl5 or NbBr5 to a series of magnesium, lithium, or potassium allylic or propargylic alkoxides directly provides allylic or allenic halides. Halogenation formally occurs through a metalla-halo-[3,3] rearrangement, although concerted, ionic, and direct displacement mechanisms appear to operate competitively. Transposition of the olefin is equally effective for allylic alkoxides prepared
将NbCl 5或 NbBr 5 添加到一系列镁、锂或钾的烯丙基或炔丙基醇盐中直接提供烯丙基或烯丙基卤化物。卤化通过金属-卤-[3,3] 重排正式发生,尽管协同、离子和直接置换机制似乎具有竞争性。烯烃的转位对于通过亲核加成、去质子化或还原制备的烯丙基醇盐同样有效。实验上,五卤化铌卤化反应迅速,萃取后可提供基本纯的 ( E )-烯丙基或烯丙基卤化物,适用于一系列脂肪族和芳香族醇、醛和酮。
Montmorillonite K10 Clay-catalyzed Synthesis of Substituted 1-Aryl Indenes from Baylis–Hillman Adducts
作者:Ponnusamy Shanmugam、Paramasivan Rajasingh
DOI:10.1246/cl.2005.1494
日期:2005.11
An eco-friend method for the synthesis of 1-aryl indenes from Baylis–Hillman adducts using Mont. K10 and microwave combination as catalyst system and a procedure for the synthesis of β-phenyl-subst...
A facile route for the synthesis of 20 new 1,4-disubstituted tetrazolone derivatives from allyl bromides of Baylis-Hillman adducts and various 1-substituted tetrazolones is described. All the synthesized compounds were screened for in vitro antibacterial and antifungal activity. Out of 20 newly synthesized compounds 16 compounds showed very good activity against the Gram-positive bacteria Bacillus subtilis compare to the standard drug ciprofloxacin. The compounds 7b, 7n and 7o showed remarkable activity against both the Gram-positive bacteria B. subtilis and Staphylococcus aureus. Two compounds 7l and 7o showed very good activity against the Gram-negative bacteria Escherichia coli. The compounds, when tested for antifungal activity four compounds- 7b, 7l, 7o and 7s- showed very good activity against the strain Aspergillus niger, whereas seven compounds- 7e, 7g, 7h, 7l, 7o and 7s- display good activity against Candida albicans. Compounds 7b, 7e, 7g, 7l and 7o exhibited very good-to-high activity towards all the strains tested.
Antimalarial activity of 3-hydroxyalkyl-2-methylene-propionic acid derivatives
作者:Mrinal K. Kundu、N. Sundar、Srinivas K. Kumar、Sujata V. Bhat、Sukla Biswas、Neena Valecha
DOI:10.1016/s0960-894x(99)00057-8
日期:1999.3
Several Baylis-Hillman adducts and their derivatives were synthesized and evaluated as targeted potential anti-malarials, The compounds 4, 7 and 9 were found to have highest potency against P. falciparum in vitro. The in vivo test result of compound 4 and 9 against P. berghei demonstrated activity at 80 mg/Kg dose level. (C) 1999 Elsevier Science Ltd. All rights reserved.