Journal of the American Chemical Society, 124(20), 5630-5631 (2002-05-16)
A new class of substituted seven-membered lactones 3 were conveniently synthesized via cyclization of o-iodobenzyl alcohol 1 (o-IC(6)H(4)CH(2)OH) with various propiolates 2 (RC triple bond CCOOMe) in the presence of Ni(dppe)Br(2) and Zn powder in acetonitrile at 80 degrees C.
Synthesis of indenones via palladium-catalyzed annulation of internal alkynes.
Larock RC, et al.
The Journal of Organic Chemistry, 58(17), 4579-4583 (1993)
Journal of organometallic chemistry, 692(21), 4731-4736 (2007-10-01)
The Zr-catalyzed methylalumination of heterosubstituted arylethynes containing O, S, Cl, and Si can proceed in high yields (>70%) and in a highly regio- and stereoselective manner (≥98-99%), although SO(2)Ph, Br, and Cl in a benzylic position present serious chemoselectivity-related problems.
