Reduction of Amides to Amines with Pinacolborane Catalyzed by Heterogeneous Lanthanum Catalyst La(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>@SBA-15
作者:Chenjun Guo、Fangcao Zhang、Chong Yu、Yunjie Luo
DOI:10.1021/acs.inorgchem.1c01531
日期:2021.9.6
Hydroboration of amides is a useful synthetic strategy to access the corresponding amines. In this contribution, it was found that the supported lanthanum benzyl material La(CH2C6H4NMe2-o)3@SBA-15 was highly active for the hydroboration of primary, secondary, and tertiary amides to amines with pinacolborane. These reactions selectively produced target amines and showed good tolerance for functional
酰胺的硼氢化是获得相应胺的有用合成策略。在该贡献中,发现负载的镧苄基材料 La(CH 2 C 6 H 4 NMe 2 - o ) 3 @SBA-15 对伯、仲和叔酰胺与频哪醇硼烷硼氢化成胺具有高度活性。这些反应选择性地产生目标胺,并显示出对 -NO 2等官能团的良好耐受性、-卤素和-CN,以及S和O等杂原子。这种还原过程表现出多相催化剂的可回收和可重复使用的特性,适用于克级合成。反应机理是基于一些控制实验和以前的文献提出的。这是由多相催化剂介导的酰胺硼氢化还原为胺的第一个例子。
Hydroborative reduction of amides to amines mediated by La(CH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>NMe<sub>2</sub>-<i>o</i>)<sub>3</sub>
作者:Fangcao Zhang、Chenjun Guo、Mingliang Gong、Hongzhen Xie、Yunjie Luo
DOI:10.1039/d1nj04996h
日期:——
amides to amines is a great challenge for resonance-stabilized carboxamide moieties, although this synthetic strategy is an attractive approach to access the corresponding amines. La(CH2C6H4NMe2-o)3, a simple and easily accessible lanthanide complex, was found to be highly efficient not only for secondary and tertiary amide reduction, but also for the most challenging primary reduction with pinacolborane
酰胺脱氧还原为胺对于共振稳定的羧酰胺部分是一个巨大的挑战,尽管这种合成策略是获得相应胺的有吸引力的方法。La(CH 2 C 6 H 4 NMe 2 - o ) 3是一种简单易得的镧系元素络合物,被发现不仅对于仲酰胺和叔酰胺还原非常有效,而且对于频哪硼烷最具挑战性的初级还原也是如此。该方案对许多官能团和杂原子表现出良好的耐受性,可应用于克级合成。该催化循环中的活性物质可能是镧系元素氢化物。
Mitsunobu Reaction Using Basic Amines as Pronucleophiles
作者:Hai Huang、Jun Yong Kang
DOI:10.1021/acs.joc.7b00622
日期:2017.7.7
reaction to include amine nucleophiles to form C–N bonds through the utilization of N-heterocyclic phosphine-butane (NHP-butane) has been developed. Both aliphatic alcohols and benzyl alcohols are suitable substrates for C–N bond construction. Various acidic nucleophiles such as benzoic acids, phenols, thiophenol, and secondary sulfonamide also provide the desired products of esters, ethers, thioether
Scalable synthesis of secondary and tertiary amines by heterogeneous Pt-Sn/γ-Al2O3 catalyzed N-alkylation of amines with alcohols
作者:Kaikai Wu、Wei He、Chenglin Sun、Zhengkun Yu
DOI:10.1016/j.tet.2016.11.029
日期:2016.12
Synthesis of secondary and tertiaryamines has been efficiently realized from the N-alkylation of amines with alcohols by means of heterogeneous bimetallic Pt-Sn/γ-Al2O3 catalyst (0.5 wt % Pt, molar ratio Pt:Sn = 1:3) through a borrowing hydrogen strategy. The Pt-Sn/γ-Al2O3 catalyst has exhibited very high catalytic activity towards a wide range of amines and alcohols, and can be conveniently recycled
Oxidation–Reduction Condensation of Diazaphosphites for Carbon–Heteroatom Bond Formation Based on Mitsunobu Mechanism
作者:Hai Huang、Jun Yong Kang
DOI:10.1021/acs.orglett.6b03709
日期:2017.2.3
An efficient oxidation–reduction condensation reaction of diazaphosphites with various nonacidic pronucleophiles in the presence of DIAD as a weak oxidant has been developed for carbon–heteroatombond formation. This mild process affords structurally diverse tertiary amines, secondary amines, esters, ethers, and thioethers in moderate to excellent yields. The selective synthesis of secondary amines