Heteroatomic Modulation of Oxyanionic Cope Rearrangement Rates. Consequences on Competing Nucleophilic Cleavage of an Oxetane Ring in Precursors to Paclitaxel
The synthesis of the δ-lactone portion of the mevinic acids; a new non-acidic method of cyclic lactone expansion
作者:Alan H. Davidson、Chris D. Floyd、Christopher N. Lewis、Peter L. Myers
DOI:10.1039/c39880001417
日期:——
An alkoxy-mercuration demercuration sequence has been used as the key step in an enantiospecific synthesis of a protected synthon for the lactone porton of the mevinicacids.
Synthetic Strategy for Construction of Highly Congested Tetracyclic Core (6–5–7–4) of Harziane Diterpenoids
作者:Qian Tu、Zheyuan Wang、Zhongchao Zhang、Jun Huang、Zhen Yang
DOI:10.1021/acs.orglett.1c00769
日期:2021.6.4
structurally intriguing tetracycliccore of complex harziane diterpenoid was constructed in 14 steps from commercially available 3-ethoxycyclohex-2-en-1-one. The key steps were a Mn/Cu-mediated oxidative 1,3-dicarbonyl radical cascade cyclization reaction, which diastereoselectively formed the core of dimethylbicyclo[3.2.1]octane structure, and a Au-catalyzed diastereoselective formal [2 + 2] cycloaddition