1: With methanesulfonyl chloride; N-ethyl-N,N-diisopropylamine in tetrahydrofuran; water; dimethyl sulfoxide T=0 - 8°C; 1.5 h; 2: With N-ethyl-N,N-diisopropylamine in methanol; acetonitrile T=60 - 63°C; 2.33333 h; 3: With ammonium chloride in methanol; water; ethyl acetate; acetonitrile T=25°C;