Optically Active Aromatic and Heteroaromatic α-Amino Acids by a One-Pot Catalytic Enantioselective Addition of Aromatic and Heteroaromatic C−H Bonds to α-Imino Esters
作者:Steen Saaby、Pau Bayón、Pompiliu S. Aburel、Karl Anker Jørgensen
DOI:10.1021/jo0256787
日期:2002.6.1
procedure for the synthesis of non-natural aromatic and heteroaromatic alpha-amino acids is reported. Starting from readily available starting materials and application of a chiral BINAP-Cu(I) catalyst, the optically active products are formed with readily removable N-protecting groups. The scope of the reaction is demonstrated by the addition of substituted furans, thiophenes, pyrroles, and aromatic compounds
Zinc/Iron-Mediated Ring Opening of Dibromocyclopropanes for In Situ Diels-Alder Reactions with Electron-Deficient Aldehydes and Imines
作者:Florian Pünner、Gerhard Hilt
DOI:10.1002/ejoc.201300726
日期:2013.9
the carbonyl group of aldehydes, ketones, glyoxylic esters, or imines is necessary for the ring-opening reaction. The ring opening leads to a bromo-functionalized 1,3-diene, which then reacts in situ with the carbonyl group in a hetero-Diels–Alder reaction. The products are formed with high control of the regiochemistry and in good yields for electron-deficient aldehydes and imines, such as carbamates