The ring cleavage of N-aryl- and N-(arylsulfonyl)histamines with di-tert-butyl dicarbonate in aqueous acetonitrile containing KOAc provides a one-pot synthesis of 4-acylamino- or 4-arylsulfonylamino-1,2-bis(tert -butoxycarbonylamino)butanes. Removal of the Boc groups in these protected triamines with trifluoroacetic acid or dry HCl in MeOH, followed by alkylation with benzyl bromoacetate, and then hydrogenation leads to N 4-acyl-1,2,4-butanetriamine -N 1,N 1,N 2,N 2 -tetraacetic acids and the N 4-arylsulfonyl analogs, respectively.
N-芳基和N-(芳基磺酰基)
组胺与二叔丁基二
碳酸酯在含有
醋酸钾的
水相
乙腈中反应,提供了一种一步合成4-酰
氨基或4-芳基磺酰
氨基-1,2-双(叔丁氧基碳酰
氨基)
丁烷的方法。随后用
三氟乙酸或干
氯化氢在
甲醇中去除这些保护的三胺中的Boc基团,再进行苄基
溴乙酸的烷基化,最后进行氢化,分别得到N-4-酰基-1,2,4-丁三胺-N-1,N-1,N-2,N-2-
四乙酸和N-4-芳基磺酰基类似物。