1: 1-benzenesulfonyl-6-methoxy-3-vinyl-1H-indole With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 1 h; 2: N,N-dimethyl acetamide in tetrahydrofuran T=-78 - -10°C; 3: With hydroxylamine hydrochloride; sodium acetate in 1,2-dichloro-benzene 8 h; Heating;

1: LDA / tetrahydrofuran 2: NH2OH*HCl; AcONa / 1,2-dichloro-benzene / Heating View Scheme