Cycloadditions between methyl (Z)-2-bromo-4,4,4-trifluoro-2-butenoate and various tosylacetamides: Synthesis of trifluoromethylated pyroglutamates and 2-pyridones derivatives
作者:Hong-Hai Zhang、Wei Shen、Long Lu
DOI:10.1016/j.tetlet.2018.01.095
日期:2018.3
Cycloaddition reactions between methyl (Z)-2-bromo-4,4,4-trifluoro-2-butenoate and various 2-tosylacetamides are described. Various 2-tosylacetamides react with methyl (Z)-2-bromo-4,4,4-trifluoro-2-butenoate in the presence of NaH at room temperature in one step to form trifluoromethylated pyroglutamates as single diastereomers. However, employing the same reactants using t-BuOK as base at −78 °C results
Stereospecific synthesis of trifluoromethyl-substituted polyfunctionalized cyclopropanes
作者:Yi Wang、Xiaoming Zhao、Youhua Li、Long Lu
DOI:10.1016/j.tetlet.2004.08.064
日期:2004.10
Treatment of methyl (Z)-2-bromo-4,4,4-trifluoro-2-butenoate 1 with active methylene compounds 2 in the presence of NaH as base affords a stereospecific synthetic route to trifluoromethyl substituted cycloproparies in good yields. (C) 2004 Elsevier Ltd. All rights reserved.