Unprecedented <i>E</i>-stereoselectivity on the sigmatropic Hurd–Claisen rearrangement of Morita–Baylis–Hillman adducts: a joint experimental–theoretical study
作者:Vinicius Sobral Silva、Terezinha Alves Tolentino、Tiago Costa Alves Fontoura Rodrigues、Fernanda Ferrari Martins Santos、Daniel Francisco Scalabrini Machado、Wender Alves Silva、Heibbe Cristhian Benedito de Oliveira、Angelo Henrique Lira Machado
DOI:10.1039/c9ob00533a
日期:——
first systematic investigation of the tandem mercury(II) catalysed transvinylation/Hurd–Claisen rearrangement of MBH adducts derived from alkyl acrylates. This is the first report of E-selectivity for MBH adducts with alkyl side chains and is complementary to the previously reported Johnson–Claisen and Eschenmoser–Claisen rearrangements. The rearrangement products were obtained in good yields and could
The Baylis–Hillman chemistry in aqueous media: elucidation of mechanism for synthesis of ether side-product leads to an efficient approach to C–O bond formation
The formation of an ether from the Baylis-Hillman (BH) adduct during the BH reaction of 5-isoxazolecarboxaldehydes is a common phenomenon if the reaction is allowed to proceed for longer periods. The amount of formation of such ethers depends on the acrylates used and is most significant for tert-butyl acrylates. A study of the plausible mechanism for the formation of these side-products led to reactions of acetates of BH adducts with phenol in aqueous media to yield the corresponding 3-phenoxy alk-2-enoates in good yields. The successful translation of solution phase methodology to solid phase for application towards combinatorial chemistry is discussed. (C) 2003 Elsevier Science Ltd. All rights reserved.
Synthesis and cyclo-oligomerization of 2-(bromomethyl)-3-aryl-2-propenoic acid derivatives
作者:Yusuf Zulykama、Paramasivan T. Perumal
DOI:10.1016/j.tetlet.2009.04.053
日期:2009.7
2-Bromomethyl-3-aryl-2-propenoic acids have been synthesized from Baylis–Hillman adducts derived fromaromaticaldehydes and t-butyl acrylates as new precursors in MBH chemistry. Further triolides were synthesized by the cyclo-oligomerization of 2-bromomethyl-3-aryl-2-propenoic acids in the presence of Cs2CO3 demonstrating the synthetic utility of these motifs.
2-溴甲基-3-芳基-2-丙烯酸是由MBIS化学中的新前体芳族醛和丙烯酸叔丁酯衍生的Baylis-Hillman加合物合成的。在Cs 2 CO 3存在下,通过2-溴甲基-3-芳基-2-丙酸的环低聚反应合成了其他三醇化物,证明了这些基序的合成效用。
Assessment of Morita-Baylis-Hillman adducts as novel modulators of quorum sensing phenotypes in Chromobacterium CV026 by targeting CviR
This work presents Morita-Baylis-Hillman adducts (MBHA) as new modulators of the violacein biosynthesis in the biosensor strain Chromobacterium CV026. Seven adducts displayed violacein reduction higher than 50±1% when tested at concentrations lower than 625 μM. The most active MBHA inhibited hydrolysis of chitin concomitantly with inhibition of violacein production in CV026, suggesting the disruption