01450nas a2200265   4500008004100000022001400041245016500055210006900220260000800289300001100297490000800308520050200316653000600818653002500824653001800849653002500867653002000892653002500912100002300937700002300960700002500983700002501008700001901033856013201052       2021                        eng d  a0040-402000aMetal-free, Tf2NH-catalyzed 1, 6-conjugate addition of imidazopyridine to para-quinone methides: easy access to C3-functionalized triarylmethane imidazopyridine0 aMetalfree Tf2NHcatalyzed 1 6conjugate addition of imidazopyridin  cNOV  a1325100 v1013 aAn inexpensive and commercially available Tf2NH-catalyzed 1,6-conjugate addition of imidazopyridine (IMPY) heterocycles to para-quinone methides (p-QMs) is reported. The present transformation provides a diverse class of C3-functionalized triarylmethanes heterocyclic derivatives of imidazopyridine. These metal-free transformations provided a very broad substrate scope of conjugate addition product with a high yield up to 97% within a short duration. (C) 2021 Elsevier Ltd. All rights reserved.10a110a6-Conjugate addition10aBronsted acid10aC3-functionalization10aImidazopyridine10apara-Quinone methide1 aKhonde, Nilesh, S.1 aSaid, Madhukar, S.1 aSabane, Jagjivan, K.1 aGajbhiye, Jayant, M.1 aKumar, Pradeep  uhttps://library.ncl.res.in/content/metal-free-tf2nh-catalyzed-1-6-conjugate-addition-imidazopyridine-para-quinone-methides-easy