Metallation of 1-(tert-butoxycarbonylamino)benzotriazole 8 leads to the dianionic species 9 which undergoes smooth reactions with a range of electrophiles, under appropriate conditions. The derived iodide 30 undergoes efficient Sonogashira coupling with a range of alk-1-yn-3-ols to provide the expected arylalkynes 33, total or partial reduction of which leads to the arylpropanols 34 and the (Z)-allylic alcohols 40 respectively. N-Deprotection and exposure to N-iodosuccinimide then led to smooth benzyne generation and intramolecular trapping by the hydroxy functions with iodine incorporation to give the iodochromanes 35 and iodochromenes 41 respectively, in respectable overall yields.
1-(tert-丁氧羰基
氨基)苯并
三氮唑8的
金属化生成二负离子物种9,该物种在适当条件下与多种电亲体发生顺利反应。所得到的
碘化物30与多种烷-1-炔-3-醇发生高效的Sonogashira偶联反应,提供了预期的芳基炔33,其中的完全或部分还原生成芳基
丙醇34和(Z)-
烯丙醇40。去保护N后,暴露于N-
碘代琥珀
酰亚胺下,顺利生成苯炔,并通过羟基功能进进行分子内捕捉,结合
碘形成
碘代色烯35和
碘代色烯41,整体产率令人满意。