1: thionyl chloride / methanol / Heating 2: thionyl chloride / 2 h / Heating View Scheme

1.1: thionyl chloride / methanol / Heating 2.1: thionyl chloride / 2 h / Heating 3.1: triethylamine / CH2Cl2 / 0.17 h / 0 °C 4.1: sodium azide / dimethylformamide / 30 h / 50 °C 5.1: tetrahydrofuran / 24 h / 0 - 20 °C 6.1: water / tetrahydrofuran / 48 h 6.2: 4M hydrochloric acid / ethyl acetate / 24 h View Scheme

thionyl chloride in methanol Deacetylation; Heating;