H2‐O‐T! Aromatic O‐heterocycles are a challenging substrates for asymmetrichydrogenation (H2). An in situ formed chiral N‐heterocyclic carbene (NHC) ruthenium complex allows the high yielding, completely regioselective, and highlyasymmetrichydrogenation of substituted benzofurans at room Temperature, giving valuable 2,3‐dihydrobenzofurans (see scheme).
H 2 ‐O‐T!芳族O杂环是不对称氢化(H 2)的具有挑战性的底物。原位形成的手性N-杂环卡宾(NHC)钌络合物可在T温度下以高收率,完全区域选择性和高度不对称氢化取代苯并呋喃,得到有价值的2,3-二氢苯并呋喃(参见方案)。
[EN] FXR RECEPTOR AGONIST<br/>[FR] AGONISTE DU RÉCEPTEUR FXR<br/>[ZH] FXR受体激动剂
Enantioselective hydrogenation of furans and benzofurans remains a challenging task. We report the hydrogenation of 2‐ and 3‐substituted furans by using iridium catalysts that bear bicyclic pyridine–phosphinite ligands. Excellent enantioselectivities and high conversions were obtained for monosubstituted furans with a 3‐alkyl or 3‐aryl group. Furans substituted at the 2‐position and 2,4‐disubstitutedfurans proved