M. Derosa et al., FIRST SYNTHESIS OF 2-AMINOPYRROLE AND SIMPLE 1-SUBSTITUTED-2-AMINOPYRROLES - OBSERVATION OF FAST PROTON-EXCHANGE AT C-5, Tetrahedron letters, 36(51), 1995, pp. 9261-9264
N-(1-substitent-1H-pyrrol-2-yl)phthalimides can be used to prepare the
previously unknown 2-aminopyrrole and 1-substituted 2-aminopyrroles w
hich undergo fast proton exchange at C-5 in acetic acid at 25 degrees
C.