5-endo-dig Cyclisations of homopropargylic sulfonamides: a new route to 2,3-dihydropyrroles and β-iodopyrroles
Abstract
5-endo-dig Iodocyclisations of the homopropargylic sulfonamides 12a–c and 13 give excellent yields of the iododihydropyrroles 14a–d and thence the β-iodopyrroles 15a–d, following base-catalysed elimination of sulfinic acid.