Transition metal promoted acetylene isomerisation reactions in organic synthesis
作者:Peter Quayle、Shopna Rahman、E.Lucy M. Ward、John Herbert
DOI:10.1016/s0040-4039(00)73103-0
日期:1994.5
A transitionmetal mediated acetylene-vinylidene rearrangement has been developed for the synthesis of spirocyclic lactones
已经开发出过渡金属介导的乙炔-亚乙烯基重排用于合成螺环内酯
O–H hydrogen bonding promotes H-atom transfer from α C–H bonds for C-alkylation of alcohols
作者:Jenna L. Jeffrey、Jack A. Terrett、David W. C. MacMillan
DOI:10.1126/science.aac8555
日期:2015.9.25
alcohols is selectively induced by using an H-bonding catalyst to bind the hydroxyl group of the alcohol. The adjacent C-H bonds now become susceptible to a reaction accelerated by another pair of catalysts. In combination, the trio of catalysts promotes C-C bond formation at the alcohol C within an array of competing sites. Science, this issue p. 1532 Hydrogen bonding confers siteselectivity in a carbon-carbon
三重奏有助于激活醇中的 CH 键酶可以通过位置良好的 H 键激活分子的特定部分来加速化学反应。杰弗里等人。在合成环境中展示氢键的力量。在这里,醇的 C 中心的反应性是通过使用 H 键催化剂来结合醇的羟基而选择性地诱导的。相邻的 CH 键现在变得容易受到另一对催化剂加速的反应的影响。组合起来,这三种催化剂促进了在一系列竞争位点内的醇 C 处形成 CC 键。科学,这个问题 p。1532 氢键在醇和烯烃之间的碳-碳键形成反应中赋予位点选择性。在存在多个潜在的氢原子供体和受体的情况下,从有机分子转移氢原子的效率和选择性通常难以控制。在这里,我们描述了一种催化活化模式的机理评估,该模式通过氢原子转移机制实现了醇与丙烯酸甲酯的高选择性光氧化还原 α-烷基化/内酯化。我们的研究表明,在烯丙基、苄基、α-C=O 和 α-醚 C-H 键存在的情况下,四正丁基磷酸铵在提高醇中 α C-H 键的选择性方面具有特
A new coupling reaction between β-lactones and electrophiles mediated by a system
作者:Fouzia Machrouhi、Jean-Louis Namy
DOI:10.1016/s0040-4020(98)00651-6
日期:1998.9
β-lactones react with ketones aldehydes and imines in the presence of a system to afford substituted tetrahydrofuranones and pyrrolidinones.
在系统存在下,β-内酯与酮醛和亚胺反应,得到取代的四氢呋喃酮和吡咯烷酮。
Samarium diiodide promoted spirolactonization of cycloalkanones
Reaction of cycloalkanones with methyl 3-bromopropionate and Sml2 afforded formation of spiroanellated γ-lactones, pinacols and unprecedented 3-(1-hydroxycycloalkyl)-1-oxaspiro[n,m]alkan-2-ones.
Direct preparation of lanthanoid ester homoenolates from 3-halo esters and lanthanoid metals: their homo-Reformatskii type reaction with carbonyl compounds