Ene-yne Tetrahydrofurans from the Sponge Xestospongia muta. Exploiting a Weak CD Effect for Assignment of Configuration
摘要:
Seven new brominated ene-yne tetrahydrofurans (THFs), mutafurans A-G, were isolated from the Bahamian sponge Xestospongia muta. The absolute configuration of the natural products was assigned as (5R, 8S) by interpretation of the Cotton effect arising from weak perturbation of an ene-yne chromophore by a propargylic THF ring.
Enantioselective C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Reductive Cross-Electrophile Coupling of Unactivated Alkyl Halides with α-Chloroboronates via Dual Nickel/Photoredox Catalysis
作者:Jun Zhou、Dong Wang、Wenhao Xu、Zihao Hu、Tao XU
DOI:10.1021/jacs.2c13220
日期:2023.2.1
enantioconvergent C(sp3)–C(sp3) bondformations have been made with nickel-catalyzed cross-coupling of racemic alkyl electrophiles with organometallic reagents or nickel-hydride-catalyzed hydrocarbonation of alkenes. Herein, we report an unprecedented enantioselective C(sp3)–C(sp3) reductive cross-coupling by the direct utilization of two different alkyl halides with dual nickel/photoredoxcatalysis system.