(2,4-Dimethoxybenzyl)hydrazine (DmbNHNH(2)) was utilized in the synthesis of Dmb-protected 4-((3,5diamino-1H-pyrazol-4-yl)diazenyl)phenols. This unambiguous protection of the pyrazole endocyclic nitrogen atom enabled the preparation of amino-substituted 4((3,5-diamino-1H-pyrazol-4yl)diazenyl) phenols that were inaccessible through direct substitution. The Boc group could be selectively cleaved in the presence of the Dmb group. (C) 2012 Elsevier Ltd. All rights reserved.
(2,4-二甲氧基苄基)
肼(DmbNHNH₂)用于合成Dmb保护的4-((3,5-二
氨基-1H-
吡唑-4-基)偶氮基)
苯酚。这种明确的
吡唑环内氮原子保护使得能够制备
氨基取代的4-((3,5-二
氨基-1H-
吡唑-4-基)偶氮基)
苯酚,这些化合物无法通过直接取代获得。在Dmb基团存在下,Boc基团可以被选择性裂解。©2012 Elsevier Ltd.所有权利保留。