Utility of Ketonic Mannich Bases in Synthesis of Some New Functionalized 2-Pyrazolines
作者:Elsayed M. Afsah、Eman M. Keshk、Abdel-Rahman H. Abdel-Rahman、Najla F. Jomah
DOI:10.1002/jhet.3055
日期:2018.1
piperazine to give 13. N‐Nitrosation of the sec‐Mannich bases 15a–d followed by reductive cyclization affords 2‐pyrazolines 17a–d. The keto base 14b has been used for the synthesis of 2‐pyrazolines having a phenolic Mannich base at C‐3 and its reaction with 3,5‐dimethyl‐1H‐pyrazole affords 23. The alkylation of 3‐methyl‐1‐phenyl‐2‐pyrazolin‐5‐one with the bis(Mannich base) 25 was investigated.
苯乙烯基酮基曼尼希碱2已被用作合成2-吡唑啉的前体,2-吡唑啉在C-3处具有碱性侧链,在C-5处具有酚类曼尼希碱。用苯肼处理双(苯乙烯基酮基)6a和8a得到双(3-官能化的2-吡唑啉)7和9。苯乙烯基酮基10和4-氨基安替比林之间的氨基转移反应生成12,后者与哌嗪反应生成13。Ñ所述的-Nitrosation秒-Mannich碱基15A - d随后还原性环化,得到2-吡唑啉17a – d。酮基14b已用于合成在C-3处具有酚类曼尼希碱的2-吡唑啉,并与3,5-二甲基-1 H-吡唑反应得到23。研究了3-甲基-1-苯基-2-吡唑啉-5-酮与双(曼尼希碱)25的烷基化反应。