Stereodivergent Alkyne Reduction by using Water as the Hydrogen Source
作者:Santhosh Rao、Kandikere Ramaiah Prabhu
DOI:10.1002/chem.201803147
日期:2018.9.18
homogeneous Pd‐catalyzed stereodivergent reduction of alkynes to Z and E alkenes by using H2O as the H2 source is presented. Mediated by a diboron reagent, the transfer hydrogenation has been accomplished to yield the desired geometrical isomer by rational ligand selection. The switchable stereoselectivity achieved using simple phosphine ligands is generally excellent. D2O has also been used as a D2 source
Synthesis of 3-sulfonylquinolines by visible-light promoted metal-free cascade cycloaddition involving <i>N</i>-propargylanilines and sodium sulfinates
A visible-light promoted radical cascade reaction of N-propargylanilines with sodium sulfinates as sulfonyl radical precursors was developed under metal-free conditions.
Chemoselective Hydroalumination of 1-Aza-but-1-en-3-ynes (<i>C</i>-Iminoalkynes): Formation of Propargylamines by Imine Reduction and of 5-Aluminazoles and 1-Aza-butadienes by Anti-Michael Attack
triple bond. Aqueous workup of those species led to 1-azabutadiene derivatives 6. High-level DFT calculations indicate that the observed chemoselectivity is only compatible with a dimeric nature of the hydroaluminating agent. Using such a dimer, the iminereduction corresponds to the kinetically controlled pathway, whereas the triple bondreduction leads to the thermodynamically much more stable 5-aluminazoles
Visible-light-induced multicomponent cascade cycloaddition involving <i>N</i>-propargyl aromatic amines, diaryliodonium salts and sulfur dioxide: rapid access to 3-arylsulfonylquinolines
作者:Deli Sun、Kun Yin、Ronghua Zhang
DOI:10.1039/c7cc09410h
日期:——
A visible-light-induced, Eosin Y catalyzed three-component synthesis of 3-arylsulfonylquinoline derivatives through N-propargyl aromatic amines, diaryliodonium salts and sulfurdioxide has been discovered. This transformation represents an efficient and attractive method for the straightforward synthesis of 3-arylsulfonylquinoline derivatives via the formation of C–S bonds and quinolines in one step
Electrooxidative tandem cyclization of <i>N</i>-propargylanilines with sulfinic acids for rapid access to 3-arylsulfonylquinoline derivatives
作者:Jie Liu、Min Wang、Laiqiang Li、Lei Wang
DOI:10.1039/d1gc00171j
日期:——
A series of N-propargylanilines (0.2 mmol) and sulfinic acids (0.5 mmol) afforded 3-arylsulfonylquinoline derivatives in high yields (70–93%) and low current efficiencies upon electrooxidation. Electrolyses were carried out in a one-compartment cell, under constant current and ambient conditions, in methanol-nBu4NBF4 containing pyridine (0.4 mmol), without any added chemical oxidant. A scale-up electrolysis
一系列N-炔丙基苯胺(0.2 mmol)和亚磺酸(0.5 mmol)以高收率(70-93%)和低电氧化效率提供了3-芳基磺酰基喹啉衍生物。在恒定电流和环境条件下,在单隔室的电解池中,在不添加任何化学氧化剂的,含有吡啶(0.4 mmol)的甲醇-n Bu 4 NBF 4中进行电解。在5mmol的N-炔丙基苯胺1a上进行放大电解,得到3-芳基磺酰基喹啉3aa,产率为65%,电流效率为56%。提出了机械学假说。