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
摘要:
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.
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
Structure–Activity Relationships of GHRP-6 Azapeptide Ligands of the CD36 Scavenger Receptor by Solid-Phase Submonomer Azapeptide Synthesis
作者:David Sabatino、Caroline Proulx、Petra Pohankova、Huy Ong、William D. Lubell
DOI:10.1021/ja203007u
日期:2011.8.17
using azapeptides to examine influences of side-chain diversity and backbone conformation. In particular, considering that aromatic cation interactions may contribute to binding affinity, we have explored the potential of introducing salt bridges to furnish GHRP-6 azapeptide ligands of the CD36 receptor. Fifteen aza-glutamic acid analogues related to 2 were prepared by submonomer solid-phase synthesis
Rate Acceleration of the Baylis−Hillman Reaction in Polar Solvents (Water and Formamide). Dominant Role of Hydrogen Bonding, Not Hydrophobic Effects, Is Implicated
作者:Varinder K. Aggarwal、David K. Dean、Andrea Mereu、Richard Williams
DOI:10.1021/jo016073y
日期:2002.1.1
A substantial acceleration of the Baylis-Hillmanreaction between cyclohexenone and benzaldehyde has been observed when the reaction is conducted in water. Several different amine catalysts were tested, and as with reactions conducted in the absence of solvent, 3-hydroxyquinuclidine was found to be the optimum catalyst in terms of rate. The reaction has been extended to other aldehyde electrophiles
Versatile O- and S-functionalized 1,2,3-triazoliums: ionic liquids for the Baylis–Hillman reaction and ligand precursors for stable MIC-transition metal complexes
作者:Daniel Mendoza-Espinosa、Rodrigo González-Olvera、Cecilia Osornio、Guillermo E. Negrón-Silva、Rosa Santillan
DOI:10.1039/c4nj02076f
日期:——
A series of O- and S-functionalized triazolium salts display high performance in the Baylis–Hillman addition and allow the one-pot formation of MIC-transition metal complexes.
Two birds, one stone! The first kineticresolution of allylfluorides was achieved by the development of an organocatalyzed enantioselectiveallylictrifluoromethylation. Two kinds of chiral fluorinated compounds, which incorporate C*F and C*CF3 units, respectively, can thus be accessed by a single transformation.