Scheme 1 Reagents and conditions: a) N-chlorosuccinimide, MeCN, reflux.
Scheme 2 Reagents and conditions: a) MeOH, reflux; b) N-chlorosuccinimide, MeCN, reflux.
Scheme 3 Reagents and conditions: a) N-iodosuccinimide, MeCN; b) N-chlorosuccinimide, MeCN, reflux.
Scheme 4 Reagents and conditions: a) 1. 70% H2SO4, NaNO2, 0 °C; b) 2. hexanes, NaH2PO2, H2O, 0 °C to rt.
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