Report copyright - Anionic [4+3] heteroannulation of 2-azidoacrylates: A ... · S4 CO2Me CO2Me Br Br Br2, CH2Cl2 0 °C, 1 h NaN3 (2.5 equiv) TBAHS, DMF, rt overnight 100% CO2Me 3N 3 27 28 29 Et3N (1.2
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