Chiral [2.2.2] Dienes as Ligands for Rh(I) in Conjugate Additions of Boronic Acids to a Wide Range of Acceptors
作者:Christian Defieber、Jean-François Paquin、Sonia Serna、Erick M. Carreira
DOI:10.1021/ol048240x
日期:2004.10.1
[reaction: see text] We document a series of investigations that led to new substituted [2.2.2]-diene ligands which display high selectivity in Rh(I)-catalyzed conjugate addition reactions to substrates not previously examined with diene ligands. Moreover, we disclose an unexpected, interesting effect that results from the introduction of a third C=C onto the ligand scaffold (cf. 1).
Copper-Catalyzed Bis(methoxycarbonyl)carbene Reactions of α,β-Unsaturated Carboxamides
作者:Gökçe Merey、Olcay Anaç
DOI:10.1002/hlca.201000384
日期:2011.6
The [Cu(acac)2]‐catalyzed reactions of α,β‐unsaturated carboxamides with dimethyl diazomalonate yielded dihydrofuran derivatives by a 1,5‐electrocyclic reaction at C(β), and butadiene derivatives by carbene addition reaction at C(α) (Schemes 4 and 5; Table). Phenyl substituents at the N‐atom of the amides seem to be effective on the reaction pathways (Table).
The chiral samarium(II) complex prepared from SmI2, (R)-BINOL, and an achiral tertiary amine promoted the reductive homo-coupling reaction of β-monosubstituted acrylic acidamides to give the corresponding 3,4-trans-disubstituted adipamides with high enantioselectivities (up to 85% ee).