Synthesis of η-arene derivatives of chromium and molybdenum containing Lewis-acid boron substituents
摘要:
The compounds Ph(CH2)(3)B(OH)(2) I, [Ph(CH2)(3)BO](3) II, Ph(CH2)(3)B(1,2-O2C6H4) III, Ph(CH2)(3)BC8H14 IV (BC8H14 = 9-borabicyclo[3.3.1]nonam-9-yl), [Cr{eta-Ph(CH2)(3)B(1,2-O2C6H4)}(CO)(3)] 1, [Cr{eta-Ph(CH2)(3)BC8H14}(C))(3)] 2, [Cr{eta-Ph(CH2)(3)BBR(2) . SMe(2)}(CO)(3)] 3, [Cr{eta-Ph(CH2)(4)BC8H14}(C))(3)] 4, [Cr(eta-Ph(CH2)(4)BC8H14}(CO)(2)(PPH3)] 5, [Cr{eta-PhCH(2)CH=CH2}(CO)(3)] 6, [Cr{eta-Ph(CH2)(2)CH=CH2}(CO)(3)] 7, [Cr{eta-Ph(CH2)(2) eta-CH=CH2}(CO)(2)] 8, [Cr{eta-Ph(CH2)(2)CH=CH2}(CO2(PPh(3))] 9, [Li(Et(2)O)(n)][Cr{eta-PhCH(2)CH=CH2}(CO)(2){C(O)Ph}] 10, [Li(Et(2)O)(n)][Cr{eta-Ph(CH2)(2)CH=CH2}(CO)(2){C(O)Ph}] 11, [Mo{eta-Ph(CH2)(3)BC8H14}(2)] 12 and [Cr{eta-Ph(CH2)(3)BOC8H14}(CO)(3)] 13, have been prepared and characterised. Compounds 1-5, 12 and 13 have pi-donor eta-arene ligands which also bear a Lewis-acid sigma-acceptor boron group. There was no evidence that these boron groups formed ground-state intra- or inter-molecular interactions with the Lewis base functions of the carbonyl oxygen atoms.
Iron-Catalyzed Hydroboration: Unlocking Reactivity through Ligand Modulation
作者:Maialen Espinal-Viguri、Callum R. Woof、Ruth L. Webster
DOI:10.1002/chem.201602818
日期:2016.8.8
hydroboration (HB) of alkenes and alkynes is reported. A simple change in ligand structure leads to an extensive change in catalyst activity. Reactions proceed efficiently over a wide range of challenging substrates including activated, unactivated and sterically encumbered motifs. Conditions are mild and do not require the use of reducing agents or other additives. Large excesses of borating reagent are not required
Photoinduced
<scp>NaI‐Promoted</scp>
Radical Borylation of Alkyl Halides and Pseudohalides
作者:Chenglan Wang、Lu Zhou、Kai Yang、Feng Zhang、Qiuling Song
DOI:10.1002/cjoc.202100115
日期:2021.7
A method for photoinduced NaI-promoted radical borylation of aliphatic halides and pseudohalides with bis(catecholato)diboron (B2cat2) as the boron source is introduced. The borylation reaction is operationally simple and shows high functional group tolerance and broad substrate scope. Preliminary mechanistic studies suggest that the reaction proceeds through SN2-based radical-generation strategy.
介绍了一种以双(儿茶酚)二硼(B 2 cat 2 )为硼源的光诱导NaI促进的脂肪族卤化物和拟卤化物自由基硼化的方法。硼酸化反应操作简单,显示出高官能团耐受性和广泛的底物范围。初步机理研究表明,该反应通过基于S N 2 的自由基生成策略进行。
A new mild radical route to 3-substituted maleimides using organoboroles
作者:Peter Birch、Andrew F. Parsons、Paul Cross
DOI:10.1016/j.tetlet.2011.12.012
日期:2012.2
A new, mild, radical route for the synthesis of 3-substituted maleimides has been developed. This new method incorporates alkene hydroboration, conjugate addition-aminoxylation and TEMPO-H elimination in a one-pot procedure, using cheap, readily available starting materials. A variety of 3-substituted maleimides have been prepared in good to excellent yield.