Scheme 2. Synthesis of 2,4,6-Trichlorophenyl Pyridine-2-sulfonates from 2-Pyridylzinc Reagents and TCPC.

Reaction conditions: HetArBr (1.0 mmol), n-BuLi (1.0 mmol), ZnCl2 (1.0 mmol), TCPC (1.0 mmol). The reported isolated yields are averages of two runs.
Reaction conditions: 2-iodopyrimidine (1.0 mmol), i-PrMgCl·LiCl (1.0 mmol), ZnCl2 (1.0 mmol), TCPC (1.0 mmol).