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1: isobutyric acid ethyl ester With n-butyllithium; diisopropylamine in diethyl ether
T=-20 - 20°C; 1.75 h; Inert atmosphereSealed flask;
2: 1,2-di(p-toluene-sulfonyloxy)ethane in diethyl ether
24 h; Reflux;
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Patent: WO2011/77081 A1, 2011 ;
Location in patent: Page/Page column 18-19 ;
