Iron-Catalyzed Ring-Opening Azidation and Allylation of O-Heterocycles
摘要:
We have established the first catalytic C-C and C-N bond formation reactions of O-heterocycles (e.g., tetrahydrofuran, phthalane, and lactone derivatives) using iron bichloride as a catalyst in the presence of TMSN3 or allylsilanes accompanied by the ring opening of O-heterocycles. The reactions smoothly proceeded at room temperature to give the corresponding primary saturated alcohols from the 2-substituted tetrahydrofurans, ortho-substituted benzyl alcohols from phthalanes, and saturated carboxylic acids from lactones in high yields.
tandem ring-closingmetathesis (RCM) double-bond isomerization reaction is described in this paper. The utility of this method for the efficient syntheses of five-, six-, and seven-membered cyclic enol ethers is demonstrated. It relies on the conversion of a metathesis-active rutheniumcarbene species to an isomerization-active ruthenium−hydride species in situ. This conversion is achieved by using various
本文描述了一种新型的钌催化串联闭环复分解(RCM)双键异构化反应。证明了该方法对五元,六元和七元环状烯醇醚的有效合成的效用。它依赖于易位活性钌卡宾物质到原位异构化活性钌氢化物物质的转化。通过使用各种添加剂可以实现这种转化。讨论了不同方案的范围和局限性,并基于31 P和1 H NMR光谱学研究提出了一些机械方面的考虑。
Nickel Complex Catalyzed Efficient Activation of sp3 and sp2 C–H Bonds for Alkylation and Arylation of Oxygen Containing Heterocyclic Molecules
作者:Yashraj Gartia、Punnamchandar Ramidi、Darin E. Jones、Sharon Pulla、Anindya Ghosh
DOI:10.1007/s10562-013-1170-8
日期:2014.3
A nickel(II) complex (1) of N,N′-bis(2,6-diisopropylphenyl)-2,6-pyridinedicarboxamido (L) ligand was examined for catalytic coupling of Grignardreagents with the C–H bond of oxygen containing heterocyclic compounds such as tetrahydrofuran and furan. The nickel(II) complex showed excellent activity in catalyzing C–H activation and further coupling with various Grignardreagents. The effective activation
New method for C–H arylation/alkylation at α-position of cyclic aliphatic ethers by iron-oxide mediated reaction
作者:Parvinder Pal Singh、Satish Gudup、Hariprasad Aruri、Umed Singh、Srinivas Ambala、Mahipal Yadav、Sanghapal D. Sawant、Ram A. Vishwakarma
DOI:10.1039/c1ob06660a
日期:——
We report a new and efficient iron oxide catalyzed cross-coupling reaction between organometallic species such as alkyl/arylmagnesium halides or organolithium species and α-hydrogen bearing cyclic unbranched and branched aliphatic ethers via activation of C(sp3)–H. In the presence of 1 mol% of iron oxide, five and six membered unbranched cyclic ethers such as tetrahydrofuran and tetrahydropyran gave
Tandem olefin metathesis/hydrogenation at ambient temperature: activation of ruthenium carbene complexes by addition of hydrides
作者:Bernd Schmidt、Michael Pohler
DOI:10.1039/b303441k
日期:——
catalyze hydrogenation reactions subsequent to ring closing olefinmetathesis. Under these conditions, hydrogenation of cyclopentenols proceeds smoothly at ambient temperature and under 1 atm of hydrogen in toluene. An alternative protocol was developed that involves the formation of hydrogen in situ by reaction of excess sodium hydride with protic functional groups and water.
Preparation of arylmagnesium/lithium from aryl bromides and their coupling and substitution reactions in tetrahydrofuran
作者:Ozlem Gundogdu、Ramazan Altundas、Yunus Kara
DOI:10.1002/aoc.3719
日期:2017.10
One‐pot synthesis of 2‐aryltetrahydrofurans was achieved by a coupling reaction between arylmagnesium bromides prepared in situ and tetrahydrofuran under mild conditions. The reaction between ArBr and n‐BuLi gave unexpected butylbenzene derivatives in moderate yields.