A Highly Reduced Ni–Li–Olefin Complex for Catalytic Kumada–Corriu Cross-Couplings
摘要:
The catalytic activity of a highly reduced Ni catalyst in the context of a Kumada-Corriu cross coupling has been studied. This nickel complex is characterized by its high electron density, stabilized by simple olefin ligands in combination with two Li ions. Landmark reactivity has been found with this precatalyst which operates at cryogenic temperatures, thus allowing the presence of sensitive functionalities. Structural elucidation of oxidative addition intermediates and their reactivity suggest highly reduced species being operative in the C-C bond forming event.
The synthesis of the (−)-enantiomer of (+)-anhydromyriocin (), the γ-lactone derived from myriocin (thermozymocidin)
作者:George Just、Daniel R. Payette
DOI:10.1016/s0040-4039(00)78650-3
日期:1980.1
The optical antipode of the lactone derived frommyriocin or thermozymocidin has been synthesized from L-arabinose.
已经从L-阿拉伯糖合成了衍生自肉豆球菌素或热zymocidin的内酯的旋光对映体。
Synthesis of the Antifungal Agent Neoenactin A and Its N-Deshydroxy Derivative
作者:Ihab S. Darwish、Marvin J. Miller
DOI:10.1021/jo00081a027
日期:1994.1
The first total and unequivocal syntheses of neoenactin A (1, NE A) as well as its N-deshydroxy analog 2 are described. The two key steps in the syntheses were the oxidative cleavage of an appropriate olefin 8a to yield the desired keto acid 9 and the Michael addition of serinehydroxamates 11 or 12 to the appropriate vinyl ketone 10. Biological activity of 1 and 2 against Escherichia coli and several fungi has been investigated.
A Highly Reduced Ni–Li–Olefin Complex for Catalytic Kumada–Corriu Cross-Couplings
The catalytic activity of a highly reduced Ni catalyst in the context of a Kumada-Corriu cross coupling has been studied. This nickel complex is characterized by its high electron density, stabilized by simple olefin ligands in combination with two Li ions. Landmark reactivity has been found with this precatalyst which operates at cryogenic temperatures, thus allowing the presence of sensitive functionalities. Structural elucidation of oxidative addition intermediates and their reactivity suggest highly reduced species being operative in the C-C bond forming event.
A total synthesis of the enantiomer of anhydromyriocin (anhydrothermozymocidin)
作者:Daniel R. Payette、George Just
DOI:10.1139/v81-044
日期:1981.1.15
The optical antipode of anhydromyriocin, the γ-lactone derived from the antibiotic myriocin (thermozymocidin), was synthesized from L-arabinose, establishing the absolute configuration of myriocin as 47. In contrast to its natural enantiomer, it showed but little antifungal activity.