The Reactivity\nof Acceptor-Acceptor Diazo Pyrazolones\nwith Allyl Thioethers under Visible Light: Access to Homoallyl Sulfides,\nSpiropyrazolones - Pesticide Analogues and Photoflow Synthesis

The novel reactivity of a less selective and more reactive\nacceptor-acceptor\nkind of diazo pyrazolone (DIPOL) has been explored under visible light\nfor the first time. We have successfully demonstrated the reaction\nof DIPOL and different allyl thioethers under blue light to construct\na wide variety of products including a pesticidal analogue exclusively\nin excellent chemoselectivity in good to excellent yields. Moreover,\n possible side products emanating from ketene were not observed. This\nprotocol works smoothly in an environmentally benign solvent under\ninert free conditions. The practicality of the protocol has been extended\nto a photoflow reaction, and also, the reaction works smoothly under\nthe direct exposure of sunlight.