Rh/bisphosphine−thiourea ligand (ZhaoPhos)‐catalyzed asymmetric hydrogenation of (Z)‐β‐substituted‐β‐boryl‐α,β‐unsaturatedesters was successfully developed, furnishing a variety of chiral β‐borylated carboxylic esters with high yields and excellent enantioselectivities (up to 99% yield and >99% ee). The gram‐scale asymmetric hydrogenation was performed efficiently in the presence of only 0.05 mol%
成功开发了Rh /双膦-硫脲配体(ZhaoPhos)催化的(Z)-β-取代的-β-硼基-α,β-不饱和酯的不对称加氢反应,提供了高收率的多种手性β-硼化羧酸酯优异的对映选择性(高达99%的收率和> 99%的ee)。在仅0.05 mol%(S / C = 2 000)催化剂负载的情况下,可以有效地进行克级不对称氢化反应,并具有完全转化率,99%的收率和99%的ee。此外,加氢产物很容易转化为其他通用的合成中间体,例如(S)-3-羟基-3-苯基丙酸甲酯和(S)-3-(呋喃-2-基)-3-苯基丙酸甲酯。
Copper-Mediated One-Pot Synthesis of Indoles through Sequential Hydroamination and Cross-Dehydrogenative Coupling Reaction
Starting from simple anilines and ester arylpropiolates, an efficient one-pot synthesis of 2-arylindole-3-carboxylate derivatives has been developed through copper-mediated sequential hydroamination and cross-dehydrogenative coupling (CDC) reaction. The initial hydroamination of anilines to ester arylpropiolates in benzene can proceed in a stereoselective manner to give ester (Z)-3-(arylamino)acrylates
The highly efficient Ni-catalyzed asymmetric hydrogenation of β-boronic ester substituted-α,β-unsaturated carboxylic esters was successfully developed using (S,S)-Ph-BPE as the ligand. A series of chiral β-borylated carboxylic esters were obtained with high yields (94%–99% yields) and excellent enantioselectivities (89%–99% ee). The gram-scale asymmetric hydrogenation with a low catalyst loading (0