Palladium catalyzed addition of carbon pronucleophiles to conjugated enynes
作者:Vladimir Gevorgyan、Chie Kadowaki、Matthew M. Salter、Isao Kadota、Shinichi Saito、Yoshinori Yamamoto
DOI:10.1016/s0040-4020(97)00602-9
日期:1997.7
Palladium catalyzed addition of certain carbon pronucleophiles 2 to conjugatedenynes 1 afforded the corresponding allenes 3 in good to excellent yields. The most reactive methynes such as methylmalononitrile 2c enabled to undergo double addition leading to alkenes 4. Catalyst optimization supported Pd2(dba)3• CHCl3 -dppf combination as the best system among all catalysts tested. The plausible mechanisms
The [(eta(3)-C3H5)PdCl](2)-dppf-AcOH catalytic system effected the hydroamination of conjugated enynes 1 leading to the formation of (E)-isomer of alkenic 1,4-diamines in stereoselective fashion. (C) 1998 Elsevier Science Ltd. All rights reserved.
Palladium(0)-catalyzed hydroboration of 1-buten-3-ynes: preparation of allenylboranes
作者:Yonetatsu Matsumoto、Masaki Naito、Tamio Hayashi
DOI:10.1021/om00043a075
日期:1992.7
Reaction of 2-substituted 1-buten-3-ynes (CH2=CR-C=CH) with catecholborane in the presence of a palladium catalyst bearing a monodentate phosphine ligand such as PPh3 or PPh2(C6F5) proceeded in a 1,4-fashion to give (3-substituted 1,2-butadienyl)-1,3,2-benzodioxaboroles (CH3(R)C=C=CH(BO2C6H4)). Reaction of the allenylboranes with benzaldehyde gave the corresponding homopropargyl alcohols.