Si-H insertion of a carbenoid, generated by decomposition of N2CHCO2Et, followed by a nucleophilic attack onto the Si-Cl bond by an alcohol. Alkylation of the title esters, reduction of the ester function and finally oxidation of the C-Si bond provide a facileentry to 1,2-diols.
(Pc-L) proves capable of promoting carbene SiH bondinsertions using diazo compounds as the carbene source. This catalytic system showed broad scope and a remarkable robustness as indicated by high TON numbers (up to 30000). Moreover, the use of enynones as carbene sources proved also feasible in hydrosilane insertion using this catalytic system. Finally, the insertion in OH and NH bonds of phenols and
Cyclobutadiene cobalt complexes as catalysts for insertion of diazo compounds into X–H bonds
作者:Nikita V. Shvydkiy、Dmitry S. Perekalin
DOI:10.1016/j.mencom.2021.04.022
日期:2021.5
Novel cyclobutadiene cobalt complex with labile naphthalene ligand [(C4Et4)Co(C10H8)]PF6 catalyzes the insertion of ethyl diazoacetate into X–H bondsgiving the corresponding products in 15–75% yields. The reaction proceeds with primary and secondary aliphatic amines, hydrosilanes and triethylamine borane but not with anilines and alcohols.
新型环丁二烯钴配合物与不稳定的萘配体 [(C 4 Et 4 )Co(C 10 H 8 )]PF 6催化重氮乙酸乙酯插入 X-H 键,以 15-75% 的产率得到相应的产物。该反应使用伯和仲脂肪胺、氢硅烷和三乙胺硼烷进行,但不适用于苯胺和醇。
Silver-catalyzed silicon–hydrogen bond functionalization by carbene insertion
作者:M. José Iglesias、M. Carmen Nicasio、Ana Caballero、Pedro J. Pérez
DOI:10.1039/c2dt31460f
日期:——
functionalization of silicon–hydrogen bonds by means of the insertion of carbene units :CHCO2Et from ethyl diazoacetate (EDA) has been achieved using a silver-based catalyst, constituting the first example of this metal to promote this transformation. Competition experiments have revealed that the relative reactivity of substituted silanes depends on the bond dissociation energy of the Si–H bond (tertiary >
Au Nanoparticle-Catalyzed Insertion of Carbenes from α-Diazocarbonyl Compounds into Hydrosilanes
作者:Marios Kidonakis、Manolis Stratakis
DOI:10.1021/acs.orglett.8b01638
日期:2018.7.6
Supported Au nanoparticles on TiO2 catalyze the insertion of carbenesfrom α-diazocabonyl compounds into hydrosilanes. It is proposed that the transformation involves two modes of catalytic activation: formation of nucleophilic Au carbenes on the surface of nanoparticle via expulsion of N2 and activation of the Si–H bond of hydrosilane on Au nanoparticle, followed by coupling of the chemisorbed species
TiO 2上负载的Au纳米颗粒催化α-二重氮羰基化合物中的苯甲酸酯向氢硅烷中的插入。建议该转化涉及两种催化活化方式:通过排出N 2在纳米粒子表面形成亲核金卡宾,以及在金纳米粒子上活化氢硅烷的Si–H键,然后进行化学吸附物质的偶联。不需要外部配体或添加剂,而该过程是纯均相的,因此可以回收和再利用催化剂。