Synthesis of Heterocyclic Compounds by Ring Transformations of 2-Formyl Pentose Glycals
作者:Manfred Michalik、Klaus Peseke、Ahmed Bari、Holger Feist、Dirk Michalik
DOI:10.1055/s-2004-831252
日期:——
2-Formyl-d-xylal 2a and 2-formyl-l-arabinal 2b were reacted with hydrazines to furnish the 4-[1,2-bis(benzyloxy)-3-hydroxypropyl]-1H-pyrazoles 3a-f. Treatment of 2b with 5(3)-aminopyrazole-4-carboxylates 5a-d in the presence of NaH afforded the ethyl 6-[1,2-bis(benzyloxy)-3-hydroxypropyl]pyrazolo[1,5-a]pyrimidine-3-carboxylates 6a-d. Ring transformation of 2a,b with 2-aminobenzimidazole yielded the 3-[1,2-bis(benzyloxy)-3-hydroxypropyl]benzo[4,5]imidazo[1,2-a]pyrimidines 7a,b.
将 2-甲酰基-d-木醛 2a 和 2-甲酰基-l-阿拉伯醛 2b 与肼反应,得到 4-[1,2-双(苄氧基)-3-羟基丙基]-1H-吡唑 3a-f。将 2b 与 5(3)-氨基吡唑-4-羧酸盐 5a-d 在 NaH 存在下处理,可得到 6-[1,2-双(苄氧基)-3-羟基丙基]吡唑并[1,5-a]嘧啶-3-羧酸乙酯 6a-d。将 2a,b 与 2-氨基苯并咪唑进行环转化,可得到 3-[1,2-双(苄氧基)-3-羟基丙基]苯并[4,5]咪唑并[1,2-a]嘧啶 7a,b。