Figure 1

Synthesis and chemical structure of BP. (i) n-BuLi, N,N′-dimethylformamide, THF, −78 °C, (ii) 1,4-dimethylpyridinium iodide, piperidine, chloroform/methanol (1:3), 60 °C.

Synthesis and chemical structure of BP. (i) n-BuLi, N,N′-dimethylformamide, THF, −78 °C, (ii) 1,4-dimethylpyridinium iodide, piperidine, chloroform/methanol (1:3), 60 °C.