Rhodium-Catalyzed Enantioselective Conjugate Addition of Sodium Tetraarylborates to 2,3-Dihydro-4-pyridones and 4-Quinolones by Using (R,R)-1,2-Bis(tert-butylsulfinyl)benzene as a Ligand
(R,R)-1,2-Bis(tert-butylsulfinyl)benzene as an efficient and simple ligand can be applied in the rhodium-catalyzed asymmetric 1,4-addition of sodiumtetraarylborate reagents to N-substituted 2,3-dihydro-4-pyridones and 4-quinolones. The reactions proceeded smoothly to provide the corresponding adducts in good yields (up to 92%) and excellent enantioselectivities (up to 99% ee) under mild conditions
Enantioselective Copper-Catalyzed Alkynylation of Quinolones Using Chiral P,N Ligands
作者:Dáiríne M. Morgan、Cian M. Reid、Patrick J. Guiry
DOI:10.1021/acs.joc.3c01944
日期:2024.2.2
catalytic enantioselective alkynylation of quinolones. In this reaction, quinolones are silylated to form a quinolinium ion which then undergoes an enantioselective attack by a copper acetylide, templated by (S,S,Ra)-UCD-Phim. This gives alkynylated products (24 examples) in yields of up to 92% and enantioselectivities of up to 97%. This methodology has been applied to the synthesis of two natural products
在此,我们报道了喹诺酮类药物的催化对映选择性炔基化反应。在此反应中,喹诺酮类化合物被甲硅烷基化形成喹啉鎓离子,然后该离子受到以 ( S , S , R a )-UCD-Phim 为模板的乙炔铜的对映选择性攻击。这样得到的炔基化产物(24 个实例)的产率高达 92%,对映选择性高达 97%。该方法已应用于两种天然产物(+)-cuspareine 和(+)-galipinine 的合成。