Regioselective Synthesis of Mono- and Dispiropyrazoline Derivatives via 1,3-dipolar Cycloaddition with Nitrilimines
作者:Fadwa Rouatbi、Chourouk Mhiri、Moheddine Askri、Michael Knorr、Yoann Rousselin、Marek M. Kubicki
DOI:10.1002/jhet.2684
日期:2017.3
The 1,3‐dipolar cycloaddition reaction of (E,E)‐1,3‐bis(arylidene)indan‐2‐one 1a, 1b, 1c, 1d, 1e with diarylnitrilimines, generated in situ via dehydrohalogenation of the corresponding hydrazonoyl chlorides 2a, 2b, 2c, affords predominantly monospiropyrazolines 3 and 4 as a mixture of diastereoisomers. Also dispiropyrazolines 5 are formed in moderate yields. The structure and stereochemistry of cycloadducts
(E,E)-1,3,双(芳基)茚满-2-1 1a,1b,1c,1d,1e与二芳基亚氨基limines的1,3-偶极环加成反应是通过相应的azo酰氯的脱卤化氢而原位产生的2a,2b,2c主要提供非对映异构体混合物形式的单螺并吡唑啉3和4。还以中等收率形成了双螺并吡唑啉5。的结构和cycloadducts的立体化学3,4,5通过1 H和13 C-NMR光谱,元素分析数据以及3ba和5ca的单晶X射线衍射研究得到了证实。