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)。
Donnelly, Dervilla M. X.; O'Reilly, Joseph, Journal of Chemical Research, Miniprint, 1980, # 1, p. 127 - 138