Table 2. Scope of Deuteration in Tandem Cyclization^a.

^aReaction conditions: N-heterocycle 1 (0.5 mmol), haloarylalkyne 2 (0.5 mmol), CuI (5 mol %), BtCH₂OH (10 mol %), and KO^tBu (1.4 equiv) in 2.0 mL of DMSO-d₆ at 120 °C for 18 h.

^bIsolated yields.