Simultaneous synthesis of 4,5-dihydro-3H-azepines and 3H-azepines, bearing alkoxy and alkylsulfanyl substituents, through metallation of 2-aza-1,3,5-trienes by t-BuOK
作者:Nina A. Nedolya、Ol’ga A. Tarasova、Ol’ga G. Volostnykh、Alexander I. Albanov、Boris A. Trofimov
DOI:10.1016/j.jorganchem.2011.07.016
日期:2011.10
and 3H-azepines have simultaneously been obtained from conjugated 2-aza-1,3,5-trienes by treatment with t-BuOK under mild reaction conditions (THF/DMSO, ∼−30 °C, 30 min). One-pot synthesis of 1-aza-1,3,4-trienes from α-lithiated alkoxyallenes, isopropyl isothiocyanate and alkyl iodides, followed by the thermally induced sigmatropic [1,5]-H shift, easily leads to starting 2-aza-1,3,5-trienes. The reaction
通过在温和的条件下用t -BuOK处理,同时从共轭2-氮杂-1,3,5-三烯中同时获得了一系列新的烷氧基和烷基硫烷基取代的4,5-二氢-3 H-氮杂环庚烷和3 H-氮杂环庚烷。反应条件(THF / DMSO,〜-30°C,30分钟)。由α-锂化的烷氧基丙二烯,异硫氰酸异丙酯和烷基碘化物一锅合成1-氮杂-1,3,4-三烯,然后热诱导σ[1,5] -H转变,很容易导致2-氮杂-1,3,5-三烯。该反应通过氮杂三烯基阴离子的产生和[1,7]-电环化而进行,并且代表了一种新颖的简单方法来同时处理氮杂环庚二烯和氮杂环庚烯。