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
Alkenenitrile Transmissive Olefination: Synthesis of the Putative Lignan “Morinol I”
作者:Fraser F. Fleming、Wang Liu、Lihua Yao、Bhaskar Pitta、Matthew Purzycki、P. C. Ravikumar
DOI:10.1002/ejoc.201101235
日期:2011.12
Z-alkenenitriles. The modular assembly of Z-alkenenitriles from a Grignard reagent, acrylonitrile, and an aldehyde is ideal for stereoselectively synthesizing alkenes as illustrated in the synthesis of the putative lignan "morinol I."
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...
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.