One-pot double functionalisation of π-deficient heterocyclic lithium reagents
作者:Anthony Chartoire、Corinne Comoy、Yves Fort
DOI:10.1039/c0ob00734j
日期:——
Herein, we report an efficient method for the double functionalisation of lithiated halogenopyridines, -pyrazines or -furopyridines through a convenient one-pot electrophilic trapping/nucleophilic substitution sequence.
2,5-bis alkyl sulfonyl and 2,5-bis alkyl thio substituted-pyridines
申请人:The Dow Chemical Company
公开号:US04616087A1
公开(公告)日:1986-10-07
A process for preparing substituted-pyridines having a sulfonyl type substituted at the 3 or 5 position of the pyridine ring and a phenoxy type substituent at the 2 position is described.
本文描述了一种制备在吡啶环的3或5位置有磺酰基取代物和在2位置有苯氧基取代物的取代吡啶的过程。
Tiecco, Marcello, Bulletin des Societes Chimiques Belges, 1986, vol. 95, # 11, p. 1009 - 1020
作者:Tiecco, Marcello
DOI:——
日期:——
Woods, S. G.; Matyas, B. T.; Vinogradoff, A. P., Journal of Heterocyclic Chemistry, 1984, vol. 21, # 1, p. 97 - 101
作者:Woods, S. G.、Matyas, B. T.、Vinogradoff, A. P.、Tong, Y. C.
DOI:——
日期:——
Synthesis and easy aromatisation of 5-substituted 6-(alkylthio)-2-methoxy-2,3-dihydropyridines. A new approach to the pyridine ring
作者:Nina A. Nedolya、Nataly I. Schlyakhtina、Lyudmila V. Klyba、Igor A. Ushakov、Sergei V. Fedorov、Lambert Brandsma
DOI:10.1016/s0040-4039(02)02423-1
日期:2002.12
Reaction of lithiated methoxyallene, 1-ethoxyethoxyallene, 1-(methylthio)propyne and 2-butyne with methoxymethyl isothiocyanate, MeOCH2N=C=S followed by methylation affords the imidothioates H2C=C=C(R)C(SMe)=NCH2OMe [R=Me, OMe, OCH(Me)OEt, SMe]. Rearrangement to the fully conjugated Systems H2C=CH-C(R)=C(SMe)-N=CHOMe and subsequent electrocyclisation of these compounds leads to the 5-substituted 6-(methylthio)-2-methoxy-2,3-dihydropyridines with good to excellent yields. In the presence of acidic catalysts or by heating at elevated temperatures these dihydropyridines eliminate methanol to afford 3-substituted 2-(methylthio)pyridines. The aroma compound 2-(methylthio)-3-pyridinol was obtained by acid-catalysed treatment of 3-(1-ethoxyethoxy)-2-(methylthio)pyridine. (C) 2002 Elsevier Science Ltd. All rights reserved.