A facile synthesis of pyrazolo[3,4-<i>D</i>]pyridazines<i>Via</i>the 1,3-dipolar cycloaddition of 3-arylsydnones. Synthesis and computational studies of 1-aryl-4,5-dihydro-1<i>H</i>-pyrazolo[3,4-<i>D</i>]pyridazine-3,6-diones and their 3,6-dichloro derivatives.
作者:R. Sanyal、Bharati V. Badami
DOI:10.1002/jhet.5570430403
日期:2006.7
The synthetic utility of 1,3-dipolar cycloaddition of DMAD to sydnones has been exploited in the preparation of new 1-aryl-4,5-dihydro-1H-pyrazolo[3,4-d]pyridazine-3,6-diones 7a-j and their aromatic 3,6-dichloro analogues 8a-j. The lactam-lactim tautomerism of compound 7a has been studied by the semi emperical (PM3) and ab initio methods.
到sydnones DMAD的1,3-偶极环加成的合成实用程序已在新的1-芳基-4,5-二氢- 1的制备被利用ħ -吡唑并[3,4- d ]哒嗪-3,6-二酮7a-j及其芳族3,6-二氯类似物8a-j。化合物7a的内酰胺-内酰胺互变异构现象已通过半皇家(PM3)和从头算的方法进行了研究。