An Improved Catalytic System, Pd(PPh<sub>3</sub>)<sub>4</sub>/PhCOOH Combined Catalyst, for the Allylation of Carbon Pronucleophiles with Allenes
作者:Yoshinori Yamamoto、Nitin T. Patil、Nirmal K. Pahadi
DOI:10.1055/s-2004-829178
日期:——
The reaction of allenes with active methynes and methylenes proceeded smoothly in the presence of Pd(PPh3)4/PhCOOH combined catalyst to give the corresponding monoallylated products with E-stereoselectivity in good to high yields. This result is in marked contrast to the previous finding that the reaction of allenes with active methynes, in the presence of Pd2(dba)3·CHCl3/dppb catalyst, affords the allylation products in lower yield with lower stereoselectivities.
Allylation of Carbon Pronucleophiles with Alkynes in the Presence of Palladium/Acetic Acid Catalyst
作者:Nitin T. Patil、Isao Kadota、Akinori Shibuya、Young Soo Gyoung、Yoshinori Yamamoto
DOI:10.1002/adsc.200404046
日期:2004.6
efficient and eco-chemical process for the allylation of carbon pronucleophiles with alkynes. The reaction of alkynes with various active methynes and methylenes in the presence of Pd(PPh3)4/acetic acid gave the corresponding allylated products in high yields and high regioselectivities. In the present catalytic system, the key is the use of carboxylic acid which dramatically enhances the rate of the