1: 2-(4-bromophenyl)-5-[(prop-2-yn-1-yloxy)methyl]furan With [2-hydroxymethylpyridine][AuCl2] complex in chloroform T=20°C; 1.5 h; 2: N-phenylazodicarboximide in chloroform T=-28°C; Diels-Alder reaction; 8 h; Further stages.;