An unprecedented [4+2] cycloaddition of in situ generated azoalkenes with arylacetic acids has been developed under the catalysis of isothiourea. The reaction provided an efficient approach to the synthesis of 4,5‐dihydropyridazin‐3(2H)‐one derivatives in moderate to good yields (up to 95%). magnified image
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Li et al. (2015) studied this question.
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