tert-Butyl Peroxybenzoate-Promoted α-Methylation of 1,3-Dicarbonyl Compounds
摘要:
A tert-butyl peroxybenzoate (TBPB)-promoted direct a-methylation of 1,3-dicarbonyl compounds has been developed, providing alpha-methyl derivatives in moderate to good yields. In this procedure, TBPB plays a dual role, serving as both the methyl source and radical initiator. This work represents a key complement to the traditional alpha-methylation of 1,3-dicarbonyl compounds using methyl iodide.
<i>tert</i>-Butyl Peroxybenzoate-Promoted α-Methylation of 1,3-Dicarbonyl Compounds
作者:Songjin Guo、Qian Wang、Yan Jiang、Jin-Tao Yu
DOI:10.1021/jo502204a
日期:2014.11.21
A tert-butyl peroxybenzoate (TBPB)-promoted direct a-methylation of 1,3-dicarbonyl compounds has been developed, providing alpha-methyl derivatives in moderate to good yields. In this procedure, TBPB plays a dual role, serving as both the methyl source and radical initiator. This work represents a key complement to the traditional alpha-methylation of 1,3-dicarbonyl compounds using methyl iodide.
Sterically Hindered Chiral Ferrocenyl P,N,N-Ligands for Highly Diastereo-/Enantioselective Ir-Catalyzed Hydrogenation of α-Alkyl-β-ketoesters via Dynamic Kinetic Resolution
作者:Chuan-Jin Hou、Xiang-Ping Hu
DOI:10.1021/acs.orglett.6b02828
日期:2016.11.4
A new class of sterically hindered chiral ferrocenyl P,N,N-ligands have been prepared through a two-step transformation from (Sc,Rp)-PPFNH2, in which a new (R)-stereogenic center at the pyridinylmethyl position was generated in high diastereoselectivity. With these newly developed P,N,N-ligands, Ir-catalyzed asymmetric hydrogenation of various α-alkyl-substituted β-aryl-β-ketoesters via dynamic kinetic