Samarium diiodide-promoted intramolecular ketone–ester coupling reaction: novel cyclization and ring expansion pathway
作者:Kazuki Iwaya、Momoe Nakamura、Eietsu Hasegawa
DOI:10.1016/s0040-4039(02)01007-9
日期:2002.7
2-substituted-1-indanone-2-carboxylates were treated with samarium diiodide (SmI2), ring expansion products such as 3-substituted-1,2-naphthoquinones were isolated. Alcohols were also obtained as the mixture of cis- and trans-isomers of hydroxy and ester substituents. A reaction mechanism involving intramolecular addition of samarium ketyl radicals to ester substituents followed by ring expansion was proposed
Asymmetric Allylation of 2-Oxocycloalkanecarboxylates
作者:Masanori Yoshida、Shohei Yano、Shoji Hara
DOI:10.1055/s-0036-1588095
日期:——
this study, the highlyenantioselective α-allylation of α-substituted β-ketoesters, particularly 2-oxocycloalkanecarboxylates, is achieved by synergistic catalysis with an achiral palladium complex and a chiral primary amino acid. Various α-allylated β-ketoesters containing a quaternary carbon stereogenic center are synthesized in high yields (up to 97%) with excellent enantioselectivity (up to 99% ee)
Relay Rh(II)/Pd(0) Dual Catalysis: Selective Construction of Cyclic All-Quaternary Carbon Centers
作者:Zi-Sheng Chen、Xiao-Yan Huang、Jin-Ming Gao、Kegong Ji
DOI:10.1021/acs.orglett.6b02958
日期:2016.11.18
A novel relay Rh(II)/Pd(0) dual catalysis strategy that promotes the divergent reaction of α-diazo-carbonyl compounds with allylic carboxylates for the selective construction of cyclic all-quaternary carbon centers has been developed. This binary catalyst system rendered domino C–H insertion/allylic alkylation process under mild conditions. Remarkably, the domino catalytic reaction shows good selectivity
A microencapsulated Group VIII metal catalyst which is stable even in air, easy to recover, and reusable is disclosed. It comprises a polymer with side chains containing an aromatic substituent, and a metal catalyst comprising a Group VIII metal encapsulated in to this polymer.