The synthesis of pyrazolo[3,4-<i>d</i>]pyridazines. Photochemical cyclization to pyrazolo[3,4-<i>d</i>]pyridazin-4(5<i>H</i>)-ones with subsequent functionalization
作者:Kenji Kaji、Hiromu Nagashima、Yusho Ohta、Keizo Tabashi、Hirohisa Oda
DOI:10.1002/jhet.5570210501
日期:1984.9
The synthesis of 1,3-disubstituted and 1,3,5-trisubstituted 1H-pyrazolo[3,4-d]pyridazin-4(5H)-ones is conveniently performed by photochemical cyclization. Functionalization of the former compounds leading to the formation of 1,4-disubstituted and 1,3,4-trisubstituted 1H-pyrazolo[3,4-d]pyridazines is smoothly effected through pertinent nucleophilic substitutions.
通过光化学环化方便地进行1,3-二取代和1,3,5-三取代的1 H-吡唑并[3,4- d ]哒嗪-4(5 H)-one的合成。通过相关的亲核取代,可以平稳地实现导致形成1,4-二取代和1,3,4-三取代的1 H-吡唑并[3,4- d ]哒嗪的前一化合物的功能化。