4-Trialkylsilyl-3-pyridyl triflates (11a-b), derived from 9 and 12 by directed ortho metalation chemistry, serve as useful precursors of 3,4-pyridynes (6a-b) and lead by cycloaddition and nucleophilic trapping reactions to products (13a-b, 14a-b, 15, 16a-b, and 17a-b)
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Snieckus et al. (1992) studied this question.