Investigations concerning the organolanthanide and group 3 metallocene-catalyzed cyclization–functionalization of nitrogen-containing dienes
摘要:
Organolanthanide catalyzed cyclization-silylation of nitrogen-containing polyunsaturated systems allows access to core structures commonly found in naturally occurring alkaloids. Nitrogen-containing dienes with various substitution patterns were investigated. The method was most successful for substrates with terminal alkenes. Cyclization upon pendant 1,1-disubstituted olefins was not realized under various conditions. Interestingly, sterically hindered sulfonamides, which were previously believed to render the catalyst inactive, were actually compatible with the catalyst, thus affording the cyclized products after prolonged reaction times. Variations using fused ring systems were also investigated. (C) 2005 Elsevier Ltd. All rights reserved.
Asymmetric Palladium-Catalyzed Alkene Carboamination Reactions for the Synthesis of Cyclic Sulfamides
作者:Zachary J. Garlets、Kaia R. Parenti、John P. Wolfe
DOI:10.1002/chem.201600887
日期:2016.4.18
The synthesis of cyclic sulfamides by enantioselective Pd‐catalyzed alkene carboamination reactions between N‐allylsulfamides and aryl or alkenyl bromides is described. High levels of asymmetric induction (up to 95:5 e.r.) are achieved using a catalyst composed of [Pd2(dba)3] and (S)‐Siphos‐PE. Deuterium‐labelling studies indicate the reactions proceed through syn‐aminopalladation of the alkene and
Enantioselective Palladium-Catalyzed Arylborylation/Cyclization of Alkenes to Access Boryl-Functionalized Heterocyclic Compounds Containing Quaternary Stereogenic Centers
作者:Xingfeng Bai、Wenrui Zheng、Shaozhong Ge、Yixin Lu
DOI:10.1021/acs.orglett.2c01082
日期:2022.4.29
Asymmetric palladium-catalyzed arylboration/cyclization of both nonactivated and activated alkenes with B2pin2 was developed. A wide range of N-allyl-o-iodobenzamides and o-iodoacryanilides reacted with B2pin2 to afford borylated 3,4-dihydroisoquinolinones and oxindoles, respectively, in high yields with high enantioselectivities. The synthetic utility of this enantioselective protocol was highlighted
开发了非活化和活化烯烃与 B 2 pin 2的不对称钯催化芳基硼化/环化。范围广泛的N-烯丙基-邻碘苯甲酰胺和邻碘丙烯酰苯胺与 B 2 pin 2反应,分别以高产率和高对映选择性得到硼化 3,4-二氢异喹啉酮和羟吲哚。通过合成各种手性 3,4-二氢异喹啉酮和含有季立体碳中心的羟吲哚衍生物,包括对映体富集的罗氏抗癌剂 ( S )-RO4999200,突出了该对映选择性方案的合成效用。
Photoredox catalysis in the synthesis of γ- and δ-lactams from <i>N</i>-alkenyl trichloro- and dichloroacetamides
作者:Gisela Trenchs、Faïza Diaba
DOI:10.1039/d2ob00276k
日期:——
The first blue light-mediated synthesis of γ- and δ-lactams from trichloroacetamides is reported in the presence of fac-Ir(ppy)3 under an air atmosphere.
[Object]: To provide a compound having a novel structure effective against
Hemophilus influenzae
and erythromycin resistant bacteria (for example, resistant pneumococci and streptococci) as well as against conventional erythromycin sensitive bacteria.
[Solution]: A novel 10a-azalide compound represented by the formula (I), a pharmaceutically acceptable salt thereof or a solvate thereof, or an intermediate for the preparation of the same. The compound of the present invention has superior antibacterial activity against
Hemophilus influenzae
, erythromycin resistant pneumococci and the like, and therefore, the compound can be used as a therapeutic agent of infectious diseases.
A protocol for the intramolecularreductive coupling of unactivated arenes with unactivated alkenes has been developed with the aid of a cooperative visible light/cobalt catalytic system. This coupling is achieved via radical cascade cyclization using amines as terminal reducing reagents and water as the main hydrogen source. In their form, readily available N-allyl benzamides are converted to the