[CH2:1]([C:3]1[N:4]=[C:5]([NH2:9])[S:6][C:7]=1I)[CH3:2].C(N(CC)CC)C.[C:17]([Si:19]([CH3:22])([CH3:21])[CH3:20])#[CH:18].[NH4+].[Cl-]>C(#N)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH2:1]([C:3]1[N:4]=[C:5]([NH2:9])[S:6][C:7]=1[C:18]#[C:17][Si:19]([CH3:22])([CH3:21])[CH3:20])[CH3:2]
Under a stream of Ar the above prepared 4-ethyl-5-iodo-thiazol-2-ylamine (1.67 g, 6.57 mmol) was dissolved in 40 mL of acetonitrile and treated successively with triethylamine (2.73 mL, 3 eq.), Cul (0.125 g, 0.1 eq.), (Ph3P)2PdCl2 (0.46 g, 0.1 eq.) and ethynyltrimethylsilane (2.73 mL, 3 eq.). The flask was closed with a septum and allowed to stir for 15 h at ambient temperature. The reaction mixture was then poured onto icewater/NH4Cl, twofold extracted with ethyl acetate, washed with water and brine, dried over sodium sulfate, and evaporated to dryness. Flash chromatography (SiO2, hexane/AcOEt=7/3) afforded finally 0.598 g of the title compound as brown viscous oil, contaminated with some des-iodo-compound.
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