Propargylic Substitution, Propargylation
A catalytic asymmetric Negishi cross-coupling of racemic secondary propargylic halides with arylzinc reagents has been developed using commerically available catalyst components (NiCl2·glyme and pybox as ligand).
S. W. Smith, G. C. Fu, J. Am. Chem. Soc., 2008, 130, 12645-12647.
PMA-silica gel catalyzes efficiently the propargylation of aromatic compounds with arylpropargyl alcohols in the absence of solvent under environmentally benign conditions.
P. Srihari, J. S. S. Reddy, S. S. Mandal, K. Satyanarayana, J. S. Yadav, Synthesis, 2008, 1853-1860.
p-Toluenesulfonic acid efficiently catalyzes direct nucleophilic substitutions of the hydroxy groups of propargylic alcohols with a large variety of carbon- and heteroatom-centered nucleophiles. Reactions can be conducted under mild conditions and in air without the need for dried solvents.
R. Sanz, A. Martinez, J. M. Alvarez-Gutierrez, F. Rodriquez, Eur. J. Org. Chem., 2006, 1383-1386.
A general and efficient FeCl3-catalyzed substitution reaction of propargylic alcohols with carbon- and heteroatom-centered nucleophiles such as allyl trimethylsilane, alcohols, aromatic compounds, thiols, and amides, forms new C-C, C-O, C-S and C-N bonds.
Z.-P. Zhan, J.-L. Yu, Y.-Y. Cui, R.-F. Yang, W.-Z. Yang, J.-P. Li, J. Org. Chem., 2006, 71, 8298-8301.