New efficient protocol for aryne generation. Selective synthesis of differentially protected 1,4,5-naphthalenetriols
摘要:
Arynes are generated cleanly and rapidly by halogen-lithium exchange of ortho-haloaryl triflates with n-BuLi at -78-degrees-C. [2+4]-Cycloaddition of alpha-alkoxyaryne with 2-methoxyfuran proceeded regioselectively (head-to-head) to afford 1,4,5-naphthalenetriols.