An unusual observation in the rhodium carbenoids: [1,4]-migration in the sugar-derived α-diazo-β-ketoesters
Abstract
In competition with [1,2]-migration, [2,3]-sigmatropic rearrangement and C–H insertion, product formation via an unusual [1,4]-migration is also found to be a prominent process in the rhodium carbenoids derived from sugar α-diazo-β-keto esters 2a–d.