Aminopentadiene Imines from Zincke Salts of 3-Alkylpyridines. Application to a Synthesis of Pyridinium Salts from Amino Acids
作者:Tuan Minh Nguyen、Maria del Rayo Sanchez-Salvatori、Jean-Charles Wypych、Christian Marazano
DOI:10.1021/jo0707582
日期:2007.7.1
yields of pyridinium salt than the standard Zincke procedure, it can be advantageous in some cases, as illustrated by the synthesis of pyridiniumsalts from amino acids, a challenging reaction which does not work starting from Zincke salt in the absence of diethylamine. More generally, the reaction can be extended to primary amines featuring polar functions, as exemplified by a pyridinium salt synthesis
23 were obtained crystalline; in solution the latter equilibrates with the hexahydrotetrazine 24 as its dimer. The N-phenylimide 19 is not stable; an isolated solid appears to be a tetramer. Generated by deprotonation of 11−13, the N-arylimides 19−21 undergo in situ cycloadditions to carbondisulfide, phenyl isocyanate, phenyl isothiocyanate, and diphenylketene. The storable CS2 adduct 29 offers a neutral
Cycloadditions of isoquinolinium salts: evidence for a two-step mechanism in a stereocontrolled synthesis of substituted tetralins
作者:Ram B. Gupta、Richard W. Franck
DOI:10.1021/ja00252a015
日期:1987.9
Aspects synthetiques et mecanistiques de la reaction du chlorure de (dinitrophenyl-2,4)-2 isoquinoleinium avec des ethers vinyliques
Aspects synthetiques et mecanistiques de la reaction du chlorure de (dinitrophenyl-2,4)-2 isoquinoleinium avec des ethersvinyliques
The Solid-Phase Zincke Reaction: Preparation of ω-Hydroxy Pyridinium Salts in the Search for CFTR Activation
作者:Masahiro Eda、Mark J. Kurth、Michael H. Nantz
DOI:10.1021/jo0001636
日期:2000.8.1
of structural modifications of MPB-07 was undertaken as part of a synthetic program aimed at discovering small molecules with CFTR activation potential. Solid-phase synthesis techniques were used to prepare derivatives of MPB-07 employing the Zincke reaction for the construction of aromatic, quaternary ammonium salts such as those found in 2 or 3. In this transformation, primary amines react with highly
Cycloaddition of cyclic vinyl ethers to an isoquinolinium salt: application to the preparation of a model C-naphtylgycoside
作者:Richard W. Franck、Ram B. Gupta
DOI:10.1039/c39840000761
日期:——
The cycloaddition of cyclic enol ethers, including sugar glycals, to 2-(2,4-dinitrophenyl)isoquinolinium chloride leads to new substituted naphthaldehydes in useful yields.