Organic Synthesis Using Haloboration Reaction. XXI. A Synthesis of Prostaglandin B1Methyl Ester by the Stepwise Cross-Coupling Reaction Using (E)-(2-Bromoethenyl)diisopropoxyborane
Organic Synthesis Using Haloboration Reaction. XXI. A Synthesis of Prostaglandin B1Methyl Ester by the Stepwise Cross-Coupling Reaction Using (E)-(2-Bromoethenyl)diisopropoxyborane
highly efficient and practical synergisticallymetal/proton‐catalyzed Conia–ene reaction for the synthesis of bicyclo[3.n.1]alkanones has been developed. This synergisticcatalysis was successfully utilized in modifying natural compounds such as methyl dihydrojasmonate, α,β‐thujone, and 5α‐cholestan‐3‐one. Furthermore, the bridged carbonyl group of bicyclo[3.2.1]alkanones could be easily attacked by nucleophiles
Direct amino acid-catalyzed cascade biomimetic reductive alkylations: application to the asymmetric synthesis of Hajos–Parrish ketone analogues
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1039/b807999d
日期:——
and enantioselective process for the double cascade synthesis of highly substituted 2-alkyl-cyclopentane-1,3-diones, 2-alkyl-3-methoxy-cyclopent-2-enones and Hajos-Parrish (H-P) ketone analogs is presented via reductive alkylation chemistry. For the first time, we have developed a single-step alkylation of cyclopentane-1,3-dione with aldehydes/ketones and a Hantzsch ester through an organocatalytic reductive