Palladium-catalyzed 2-pyridylmethyl-directed β-C(sp3) H activation and cyclization of aliphatic amides with gem-dibromoolefins: A rapid access to γ-lactams
摘要:
The direct Pd-catalyzed beta-C(sp(3))-H activation and cyclization of aliphatic amides bearing a removable 2-pyridylmethyl directing group with gem-dibromoolefins is described for the first time to construct a variety of gamma-lactams. The resulting products with Z- and E-configurations can be easily separated and purified after the reaction, demonstrating the effectiveness and applicability of the method herein developed. (C) 2017 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
The regioselective carbonylation of unactivated C(sp(3))-H bonds of aliphatic amides was achieved using Ru-3(CO)(12) as a catalyst. The presence of a 2-pyridinylmethylamine moiety in the amide is crucial for a successful reaction. The reaction shows a preference for C-H bonds of methyl groups as opposed to methylene C-H bonds and tolerates a variety of functional groups. The stoichiometric reaction of an amide with Ru-3(CO)(12) gave a dinuclear ruthenium complex in which the 2-pyridinylmethylamino moiety was coordinated to the ruthenium center in an N,N manner.
Palladium-catalyzed 2-pyridylmethyl-directed β-C(sp3) H activation and cyclization of aliphatic amides with gem-dibromoolefins: A rapid access to γ-lactams
作者:Danni Zhou、Chunxia Wang、Mingliang Li、Zheng Long、Jingbo Lan
DOI:10.1016/j.cclet.2017.06.007
日期:2018.1
The direct Pd-catalyzed beta-C(sp(3))-H activation and cyclization of aliphatic amides bearing a removable 2-pyridylmethyl directing group with gem-dibromoolefins is described for the first time to construct a variety of gamma-lactams. The resulting products with Z- and E-configurations can be easily separated and purified after the reaction, demonstrating the effectiveness and applicability of the method herein developed. (C) 2017 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Ruthenium-catalyzed cyclocarbonylation of aliphatic amides through the regioselective activation of unactivated C(sp3)–H bonds
The regioselective carbonylation of unactivatedC(sp3)–Hbonds of aliphatic amides, using 2-pyridinylmethylamine as a directing group in conjunction with Ru3(CO)12 as a catalyst is described. The presence of a 2-pyridinylmethylamine moiety in the amides is crucial for the success of the reaction. Although ethylene is not incorporated into the products, its presence is also essential for the reaction