In this Communication, compound 41 was assigned as the exo stereochemistry upon Giese reaction of a pyrroloindoline redox-active ester with benzyl acrylate. On subsequent NOESY studies of 41, a correlation between H2 and H5 was observed. Therefore, the authors have concluded that the stereochemistry of the product was misassigned and should be endo instead. Prof. David Crich and co-workers have previously reported the endo quench of the radical from pyrroloindoline acid. The authors would like to acknowledge Prof. David Crich for identifying the misassignment. Additional references and NOESY spectrum of compound 41 have been attached to support this assignment. None of the conclusions in the Communication are affected.
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