Scheme 1.
Reagents and conditions: a) tributyl (vinyl)tin, PdCl2(PPh3)2, DMF, MW, 160°C, 5 min; b) morpholine, Pd(OAc)2, 2-(Di-tert-butylphosphino) biphenyl, NaOtBu, toluene, 80°C, 12 h; c) Et3N, CHCl3, RT, 2h
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