Rhodium(I)-Catalyzed Enantioselective Hydrogenation of Substituted Acrylic Acids with Sterically Similar β,β-Diaryls
作者:Yang Li、Kaiwu Dong、Zheng Wang、Kuiling Ding
DOI:10.1002/anie.201302349
日期:2013.6.24
Distinct differentiation: β,β‐Disubstituted acrylic acids with sterically similar geminal diaryl groups can be hydrogenated with excellent enantioselectivities in the presence of a RhI complex formed in situ with two‐component ligands, a chiral secondary phosphineoxide (SPO) and an achiral phosphine (Ph3P). The sense of asymmetric induction was found to be controlled by the substrate configuration
CuH-Catalyzed Asymmetric Reductive Amidation of α,β-Unsaturated Carboxylic Acids
作者:Achim Link、Yujing Zhou、Stephen L. Buchwald
DOI:10.1021/acs.orglett.0c02064
日期:2020.7.17
The direct enantioselective copper hydride (CuH)-catalyzed synthesis of β-chiral amides from α,β-unsaturatedcarboxylicacids and secondary amines under mild reaction conditions is reported. The method utilizes readily accessible carboxylicacids and tolerates a variety of functional groups in the β-position including several heteroarenes. A subsequent iridium-catalyzed reduction to γ-chiral amines
CuH-Catalyzed Asymmetric Reduction of α,β-Unsaturated Carboxylic Acids to β-Chiral Aldehydes
作者:Yujing Zhou、Jeffrey S. Bandar、Richard Y. Liu、Stephen L. Buchwald
DOI:10.1021/jacs.7b12260
日期:2018.1.17
The copper hydride (CuH)-catalyzed enantioselective reduction of α,β-unsaturatedcarboxylicacids to saturated aldehydes is reported. This protocol provides a new method to access a variety of β-chiral aldehydes in good yields, with high levels of enantioselectivity and broad functional group tolerance. A reaction pathway involving a ketene intermediate is proposed based on preliminary mechanistic
A variety of functionalized coumarins were synthesized from substituted phenylacrylic acids via PIDA/I2-mediated and irradiation-promoted oxidative carbon–oxygen bond formation. Our studies show that the oxygen in the pendant carboxylic acid group cyclizes favorably to the aryl ring that is cis to it. The main advantages of this method include good functional group tolerance and the transition-metal-free
通过PIDA / I 2介导的和辐射促进的氧化碳-氧键形成,由取代的苯基丙烯酸合成了多种功能化的香豆素。我们的研究表明,羧酸侧基中的氧有利地环化成顺式的芳基环。该方法的主要优点包括良好的官能团耐受性和无过渡金属的特性。