A Convenient Synthesis of Trifluoroacetamide Derivatives of Diaza[3<sub>2</sub>]cyclophanes and Triaza[3<sub>3</sub>]cyclophanes
作者:Hideki Okamoto、Hiroyuki Takemura、Kyosuke Satake
DOI:10.1055/s-2007-1000825
日期:2008.1
The diaza[3 2 ]cyclophane skeleton has been constructed by the bis-N-alkylation of 1,4-bis[(4-nitrophenylsulfonylamino)methyl]benzene with 1,4-bis(halomethyl)benzene in the presence of sodium hydride. The 4-nitrophenylsulfonyl (Ns) amides in the bridge chains of the cyclophane were effectively deprotected by sodium ethanethiolate and the resulting free amine moieties were reprotected as the trifluoroacetamide
在氢化钠存在下,1,4-双[(4-硝基苯基磺酰基氨基)甲基]苯与1,4-双(卤甲基)苯发生双-N-烷基化反应构建了二氮杂[3 2 ]环烷骨架。环烷桥链中的 4-硝基苯磺酰基 (Ns) 酰胺被乙硫醇钠有效脱保护,在温和条件下将所得游离胺部分重新保护为三氟乙酰胺,得到 3,7-双(三氟乙酰基)-3,7- diaza-1,5(1,4)-dibenzenacyclooctaphane,总产率为 26%。这种 Ns-酰胺法也被用于制备高级同系物三氮杂[3 3 ]环烷的三氟乙酰胺衍生物 3,5,7-tris(trifluoroacetyl)-3,7,10-triaza-1 ,5(1,3,5)-dibenzenabicyclo[3.3.3]undeca-phane,总产率为 18%。因此,