1: bromobenzene With magnesium in diethyl ether Grignard reaction; Inert atmosphere; 2: 6-methyl-2-oxo-1,2-dihydropyrimidine-5-carboxylic acid ethyl ester in tetrahydrofuran; diethyl ether T=-78°C; Grignard reaction; Inert atmosphere; chemoselective reaction;
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