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Synthesis of triarylimidazole tricyclic pyrazoles by route B. Reagents: (i) nBuLi, THF, DMF; (ii) 4-pyridyl-CH2OTBDMS, LDA, THF; (iii) TBAF, THF; (iv) oxalyl chloride, DMSO, Et3N, DMF; (v) RCHO, AcOH, AcONH4; (vi) 5 M HCl, dioxane; (vii) HC(NMe2)3, DMF; (viii) AcOH, H2NNH2.
