Table 2. General Pathway for the Synthesis of Extended 2-Bromo-3-(bromomethyl)-1,1′-biphenyl (1a) and [1,1′:2′,1″-Terphenyl]-3′-ylmethanol (1b)-Based Compounds 3b–d, 3fa.
Reagents and conditions: (A) for compound 1a where X is −Br, 5-chloro-2,4-dihydroxybenzaldehyde, NaHCO3, ACN/DMF, rt, overnight (54% for 3a); for compound 1b where X is −OH, 5-chloro-2,4-dihydroxybenzaldehyde, PPh3, DIAD, THF, rt, overnight (20% for 3e); (B) picolinonitrile/benzonitrile component, K2CO3, DMF, rt, overnight (63% for 3b, 87% for 3c, and 90% for 3f); (C) amine component, NaBH3CN, AcOH, DMF, rt, overnight (for 3d).