Organocopper reagents for the synthesis of saturated, and α,β-ethylenic aldehydes and ketones
作者:A. Alexakis、C. Chuit、M. Commerqon-Bourgain、J. P. Foulon、N. Jabri、P. Mangeney、J. F. Normant
DOI:10.1351/pac198456010091
日期:1984.1.1
intermediacy of a radical anion has, however, been questioned and several elegant experiments have focussed on the related intermediacy of a copper III species, which could be,in turn, viewed in a more plausible way as a copper II reagent where two copper atoms of the cuprate dimer release one electron each4. The counter ion (lithium in most cases) is also considered as important since its coordination to the
讨论了有机铜试剂与 ct,-乙烯醛的共轭加成。使用 cz,r3-烯属缩醛是实现相同目标的另一种方法,即将 RM 同系化为具有三个以上碳原子的醛。c,-烯醛很容易通过 c,13-乙炔缩醛的碳化反应制备。公开了一种由有机铜试剂介导的 cz,t3-乙烯酮的新方法。引言 有机铜试剂与 s,-不饱和酮和酯的共轭加成常用于有机合成。已经提出了几种机制来合理化底物(取代度)的影响和溶剂或配体的影响。最有用的方法是由 House 披露的,他将这种反应的可行性关联起来,底物在烯属底物的反键 T 系统中容纳单个电子的能力:还原电位越高(相对于 sce 始终为负),自由基阴离子越稳定。使用增量的经验规则允许预测烯酮 D 0 0 0 I e / R" CR R" 0 R=H 的电位降低:-1.9 伏特 1 伏特 23.05 kcal/摩尔 烷基(供体)通过-0.1 V.,烷氧基也,如果位于 R、R 或 R" (-0