A general protocol for the highly exo-selective macrocyclization of ynals using a nickel/N-heterocyclic carbene catalyst system has been developed. A series of 10- to 21-membered macrocycles bearing an exomethylene substituent was synthesized in good yields with excellent regioselectivity (exo/endo >95:5). Very high levels of long-range diastereocontrol can also be achieved for some classes of macrocycles. Complementary to previously reported endo-selective macrocyclizations, this method provides accesses to exoalkylidene macrocycles from simple ynals in high selectivity.
申请人:Commissariat A L'Energie Atomique Et Aux Energies Alternatives
公开号:US20150148535A1
公开(公告)日:2015-05-28
The present invention relates to a method for preparing nitrogen compounds using carbon dioxide, and to the use of the method in the production of vitamins, pharmaceutical products, adhesives, acrylic fibres, synthetic leathers, pesticides, herbicides, antifungal agents and fertilisers. The invention also relates to a method for producing vitamins, pharmaceutical products, adhesives, acrylic fibres, synthetic leathers, pesticides, herbicides, antifungal agents and fertilisers, which includes a step of preparing nitrogen compounds using the method of the invention. The invention further relates to a method for preparing labelled nitrogen compounds using carbon dioxide and to the uses thereof.
Pd-PEPPSI-IPent<sup>Cl</sup>: A Highly Effective Catalyst for the Selective Cross-Coupling of Secondary Organozinc Reagents
作者:Matthew Pompeo、Robert D. J. Froese、Niloufar Hadei、Michael G. Organ
DOI:10.1002/anie.201205747
日期:2012.11.5
of new N‐heterocyclic carbene based Pd complexes has been created and evaluated in the Negishi cross‐coupling of aryl and heteroaryl chlorides, bromides, and triflates with a variety of secondary alkylzinc reagents (see scheme). The direct elimination product is nearly exclusively formed; in most examples there is no migratory insertion at all.
申请人:Commissariat A L'Energie Atomique Et Aux Energies Alternatives
公开号:US20150152072A1
公开(公告)日:2015-06-04
The present invention relates to a method for preparing methylated amines using carbon dioxide and to the use of the method for manufacturing vitamins, pharmaceutical products, glues, acrylic fibres and synthetic leathers, pesticides and fertilizers. The invention also relates to a method for manufacturing vitamins, pharmaceutical products, glues, acrylic fibres, synthetic leathers, pesticides and fertilizers, including a step of preparing methylated amines by the method according to the invention. The present invention also relates to a method for preparing marked methylated amines and to the uses thereof.
Cytotoxicity of cationic (NHC)Cu(I) complexes bearing 2,2′-dipyridylamine (dpa) type ligands has been evaluated toward 4 cancer cell lines, and compared to the one of neutral (NHC)Cu(I) complexes. The high cytotoxicity of these novel cationic (NHC)Cu(I) complexes, combined with the straightforward synthesis, and versatility of dpa type ligands may offer new prospects in cancer research, toward the
straightforward synthesis of a variety of silver(I) complexes featuring challenging NHC ligands. Stericallyhindered including electron-poor or with very low solubility imidazolium salts were ground with silver(I) oxide to furnish heteroleptic or homoleptic complexes in high yields and short reaction times. The synthesis of heteroleptic bis-NHC silver(I) complexes was also performed for the first time in a