Synthesis and Cross-Coupling of Sulfonamidomethyltrifluoroborates
摘要:
Sulfonamidomethyltrifluoroborates were successfully synthesized and cross-coupled with a wide range of aryl and heteroaryl chlorides, allowing the construction of a sulfonamidomethyl aryl linkage through a new disconnection, thus offering a new way to access such structurally interesting motifs.
reactions of amines/amides with alcohols in the past. By employing the aerobicrelayracemethodology with Pd‐catalyzed aerobicalcohol oxidation being a more effective protocol for alcohol activation, ligand‐free homogeneous palladiums are successfully used as active catalysts in the dehydrative N‐alkylation reactions, giving high yields and selectivities of the alkylated amides and amines. Mechanistic
Efficient and versatile catalysis of N-alkylation of heterocyclic amines with alcohols and one-pot synthesis of 2-aryl substituted benzazoles with newly designed ruthenium(<scp>ii</scp>) complexes of PNS thiosemicarbazones
作者:Rangasamy Ramachandran、Govindan Prakash、Sellappan Selvamurugan、Periasamy Viswanathamurthi、Jan Grzegorz Malecki、Venkatachalam Ramkumar
DOI:10.1039/c4dt00006d
日期:——
or As, L = 2-(2-(diphenylphosphino)benzylidene) thiosemicarbazone (PNS-H), 2-(2-(diphenylphosphino)benzylidene)-N-methylthiosemicarbazone (PNS-Me), 2-(2-(diphenylphosphino)benzylidene)-N-phenylthiosemicarbazone (PNS-Ph)) have been synthesized and characterized by elemental analysis and spectroscopy (IR, UV-Vis, 1H, 13C, 31P-NMR) as well as ESI mass spectrometry. The molecular structures of complexes
Highly Site Selective Formal [5+2] and [4+2] Annulations of Isoxazoles with Heterosubstituted Alkynes by Platinum Catalysis: Rapid Access to Functionalized 1,3-Oxazepines and 2,5-Dihydropyridines
作者:Wen-Bo Shen、Xin-Yu Xiao、Qing Sun、Bo Zhou、Xin-Qi Zhu、Juan-Zhu Yan、Xin Lu、Long-Wu Ye
DOI:10.1002/anie.201610042
日期:2017.1.9
Platinum‐catalyzed formal [5+2] and [4+2] annulations of isoxazoles with heterosubstituted alkynes enabled the atom‐economical synthesis of valuable 1,3‐oxazepines and 2,5‐dihydropyridines, respectively. Importantly, this Pt catalysis not only led to unique reactivity dramatically divergent from that observed under Au catalysis, but also proceeded via unprecedented α‐imino platinum carbene intermediates
The direct reductive amination of electron-deficient amines with aldehydes: the unique reactivity of the Re2O7 catalyst
作者:Braja Gopal Das、Prasanta Ghorai
DOI:10.1039/c2cc33185c
日期:——
An unprecedented direct reductive amination of electron-deficient amines such as Cbz-, Boc-, EtOCO-, Fmoc-, Bz-, ArSO2-, Ar2PO-, etc. protected amines with aldehydes is achieved using the Re2O7 catalyst and silanes as the hydride source. Excellent regioselective mono-alkylation and chemoselective reductive-amination were observed.
Metal-Free Direct Construction of Sulfonamides<i>via</i>Iodine- Mediated Coupling Reaction of Sodium Sulfinates and Amines at Room Temperature
作者:Wei Wei、ChunLi Liu、Daoshan Yang、Jiangwei Wen、Jinmao You、Hua Wang
DOI:10.1002/adsc.201400801
日期:2015.3.23
simple, practical, and metal‐free protocol has been developed for the synthesis of sulfonamides from sodiumsulfinates and various amines through an iodine‐mediated SN bond formation reaction at room temperature. This green reaction is cost‐effective, operationally straightforward, and especially proceeds under very mildconditions to afford the target products in good to excellent yields (up to 98%)