Transition-Metal-Free Synthesis of Aryl-Substituted<i>tert</i>-Butyl Ynol Ethers through Addition/Elimination Substitution at an sp Centre
作者:Vincent J. Gray、Ben Slater、Jonathan D. Wilden
DOI:10.1002/chem.201203015
日期:2012.12.3
sulfonamide leads to displacement of the sulfonamide at the sp centre and isolation of the ynol ether in good yield in a single operation (see scheme). The mechanistic pathway has been probed by the use of coordinating additives, 13C‐labelling experiments and ab initio calculations, which indicated that an addition/elimination mechanism is in operation.
A novel sulfonamide non-classical carbenoid: a mechanistic study for the synthesis of enediynes
作者:Theodore O. P. Hayes、Ben Slater、Richard A. J. Horan、Marc Radigois、Jonathan D. Wilden
DOI:10.1039/c7ob02437a
日期:——
addition of the nucleophile to the unsaturated system to give a key alkenyl lithium species which is stabilised by an intramolecular coordination effect by a sulfonamide oxygen atom. This species can be considered a vinylidene carbenoid given the carbon atom bears both an anion (as a vinyllithium) and a leaving group (the sulfonamide). The intramolecular coordination effect serves to stabilise the vinyllithium