1: 1.) (NH4)2SO4, 1,1,1,3,3,3-hexamethyldisilazane, 2.) CsI / 1.) reflux, 15 h, 2.) MeCN, reflux, 2 h 2: 1.) lithium diisopropylamide (LDA) / 1.) THF, -70 deg C, 1 h, 2.) THF, -70 deg C, 1 h View Scheme

sodium disulfite; tetraethylammonium chloride; diethylamine; trifluoroacetic acid Yield given. Multistep reaction. Yields of byproduct given;

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