Cyclopentadienes and silylated 1,4-dienes were deprotonated with gallium trichloride (GaCl3), and the resultant pentadienylgalliums underwent an ethynylationreaction with chlorosilylethyne. The silyl substituent on the olefin had an effect to increase the acidity of the allylic protons.
Synthesis of Novel Highly Active Thiophene and Benzothiophene Containing Diphosphine Ligands and their Use in the Asymmetric Allylation of Catechol
作者:Lutz F. Tietze、J. Klaas Lohmann、Christian Stadler
DOI:10.1055/s-2004-822891
日期:——
Novel thiophene and benzothiophene containing diphosphine ligands 5-8 with a chiral cyclohexyl diamine backbone have been prepared and used in the asymmetricallylation of catechol. The advantage of these new ligands is their high reactivity and excellent selectivity. The best results were obtained using ligand 7 to give the allylated catechol 24b from 23b in 90% ee and 91% yield within 4 hours.
A new method for the synthesis of β,γ-unsaturated amides from allylic carbonate catalyzed by palladium in the presence of carbon monoxide and amine: Studies towards the total synthesis of antillatoxin
作者:Teck-Peng Loh、Guo-Qiang Cao、Zheng Yin
DOI:10.1016/s0040-4039(99)00264-6
日期:1999.3
The reaction of alpha,beta-unsaturated carbonates was carried out in DMF in the presence of PdCl2/dppb (5 mol%), CO and L-alanine at 65 degrees C for 4 days to give the beta, gamma-unsaturated amide intermediate of antillatoxin in good yield. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
Palladium-catalysed coupling between allyl carbonates and triethyl methanetricarboxylate (TEMT)
作者:Giancarlo Cravotto、Giovanni B. Giovenzana、Massimo Sisti、Giovanni Palmisano
DOI:10.1016/s0040-4020(97)10371-4
日期:1998.2
Triethyl methanetricarboxylate (TEMT) is allylated by allylic carbonates in the presence of catalytic amounts of Pd(0) complexes; the reaction, conducted in very mild conditions, is fast and gives high yields of the title products. (C) 1998 Elsevier Science Ltd. All rights reserved.
Genet, J. P.; Uziel, J.; Juge, S., Phosphorus, Sulfur and Silicon and the Related Elements, 1990, vol. 51/52, p. 883