Palladium-catalyzed inter- and intramolecular cross-coupling reactions of B-alkyl-9-borabicyclo[3.3.1]nonane derivatives with 1-halo-1-alkenes or haloarenes. Syntheses of functionalized alkenes, arenes, and cycloalkenes via a hydroboration-coupling sequence
Treatment of various organic halides with phosphinic acid (hypophosphorous acid) in aqueous ethanol in the presence of a radical initiator and a base gave the corresponding reduced products in high yields. Addition of a base is indispensable for the reduction of halides by phosphinic acid. Allylic ether of o-iodophenol or 2-haloalkanal allylic acetal underwent radical cyclization under the same conditions
Enantioselective Au(I)/Au(III) Redox Catalysis Enabled by Chiral (P,N)-Ligands
作者:Chetan C. Chintawar、Vivek W. Bhoyare、Manoj V. Mane、Nitin T. Patil
DOI:10.1021/jacs.2c02799
日期:2022.4.27
Presented herein is the first report of enantioselective Au(I)/Au(III) redoxcatalysis, enabled by a newly designed hemilabilechiral (P,N)-ligand (ChetPhos). The potential of this concept has been demonstrated by the development of enantioselective 1,2-oxyarylation and 1,2-aminoarylation of alkenes which provided direct access to the medicinally relevant 3-oxy- and 3-aminochromans (up to 88% yield
Treatment of allylic ether of 2-iodophenol or 2-haloethanal allylic acetal with phosphinic acid, a base and a radical initiator (AIBN or triethylborane) in aqueous ethanol provided the corresponding radical cyclization product in excellent yield. An addition of a base is critical to employ phosphinic acid as a radical mediator.
Gold-Catalyzed 1,2-Aminoarylation of Alkenes with External Amines
作者:Akash G. Tathe、Urvashi、Amit K. Yadav、Chetan C. Chintawar、Nitin T. Patil
DOI:10.1021/acscatal.1c00789
日期:2021.4.16
Synthesis of benzofurans in ionic liquid by a PdCl2-catalyzed intramolecular Heck reaction
作者:Xingang Xie、Bo Chen、Jiangping Lu、Junjie Han、Xuegong She、Xinfu Pan
DOI:10.1016/j.tetlet.2004.06.110
日期:2004.8
PdCl2-catalyzed intramolecular Heck reaction was conducted in ionic liquid, 1-n-butyl-3-methylimidazolium tetraborate ([BMIm] BF4), substituted benzofurans were obtained in modest to satisfactory yields. The ionic liquid containing Pd catalyst can be used four times with a little loss of activity. (C) 2004 Elsevier Ltd. All rights reserved.