Further,three secondary amino groups in GS(R)_3were alkyled by reacting with methyl iodide to give title compound,dentritic quaternary ammonium salt GI(G)_3 with 82.

• 3进一步与碘甲烷反应,其分子中的3个仲氨基被季铵化,生成树枝状季铵盐GI(R)3,产率为82。