Ring Opening of Pymisyl‐Protected Aziridines with Organocuprates
作者:Jan Bornholdt、Jakob Felding、Rasmus P. Clausen、Jesper L. Kristensen
DOI:10.1002/chem.201001026
日期:2010.11.2
The pyrimidine‐2‐sulfonyl (pymisyl) group is introduced as a new protecting group that can be used to activate aziridines towards ringopening. It is readily introduced and removed under mild conditions. Regioselective ringopening of pymisyl‐protected 2‐methyl‐aziridine with organocuprates gives the corresponding sulfonamides in high yields, and the pymisyl group can subsequently be removed upon treatment
Arylation Using Sulfonamides: Phenylacetamide Synthesis through Tandem Acylation–Smiles Rearrangement
作者:Helen L. Barlow、Pauline T. G. Rabet、Alastair Durie、Tim Evans、Michael F. Greaney
DOI:10.1021/acs.orglett.9b03429
日期:2019.11.15
and heterocyclic sulfonamides react with phenylacetyl chlorides to produce benzhydryl derivatives in a single step. The reaction proceeds via tandem amide bond formation/Dohmori-Smiles rearrangement under the simple conditions of an aqueous base. In the case of o-nosylamides, a further reaction takes place at the nitro group to yield indazoles.
A Convenient Preparation of Heteroaryl Sulfonamides and Sulfonyl Fluorides from Heteroaryl Thiols
作者:Stephen W. Wright、Kelly N. Hallstrom
DOI:10.1021/jo052164+
日期:2006.2.1
thiols may be oxidized to the sulfonyl chloride at low temperature (−25 °C) by using 3.3 equiv of aqueous sodium hypochlorite. The reaction is rapid, avoids the use of chlorine gas, and succeeds with substrates that have previously been found to afford little or none of the sulfonamide product with other procedures. The method allows the preparation of the sulfonylfluorides, which are stable enough to
Metal-Free Intermolecular Aminoarylation of Alkynes
作者:Pauline T. G. Rabet、Scott Boyd、Michael F. Greaney
DOI:10.1002/anie.201612445
日期:2017.4.3
A metal‐free aminoarylation of internalalkynes is described, yielding tetrasubstituted enaminoates. The transformation proceeds in good to excellent yields through a tandem conjugate addition/Smiles rearrangement involving aryl and heteroaryl sulfonamides. Substrate scope is very broad under simple, user‐friendly conditions, and the reaction can be used to easily access biologically active phenethylamine