1: 7-acetyloxy-8-iodo-2H-1-benzopyran-2-one With isopropylmagnesium chloride in tetrahydrofuran T=-100°C; 1 h; 2: (S)-3,3-dimethyloxirane-2-carboxaldehyde in tetrahydrofuran T=-100 - 20°C; 1 h;

1: 7-acetyloxy-8-iodo-2H-1-benzopyran-2-one With isopropylmagnesium chloride in tetrahydrofuran T=-100°C; 1 h; 2: (S)-3,3-dimethyloxirane-2-carboxaldehyde in tetrahydrofuran T=-100 - 20°C; 1 h;