Figure Representative bioactive pyrrolidines and sulfocoumarins derivatives Sulfochromeno [4,3-b] pyrrolidines 5 are bioisosteres of chromeno [4,3b] pyrrolidines and the latter ones have attracted considerable attention from chemists in the community of organic synthesis and pharmaceutical research over the past decades. [3+2] cycloaddition reactions of salicylaldehydes derived azomethine ylides with various dipolarophiles have been extensively studied for the construction of chromeno [4,3-b] pyrrolidine derivatives. In sharp contrast, method for the synthesis of their sulfur analogous are far less studied. In lines with our continuous research on SuFEx click reaction and the synthesis of heterocyclic compounds, we envisaged that ethensulfonyl fluorides 9 can be used as dipolarophiles to undergo a tandem [3+2] cyclization/SuFEx click reaction process to form sulfochromeno [4,3-b] pyrrolidines. Herein, we would like to disclose this result.