“…However, we found it convenient to adapt the procedure using the method of Tiecco and Testaferri [46]. Ligands 1, 2 and 3 were isolated in 19, 59 and 28% yields, respectively.…”
Section: Ligand Syntheses and Characterisationsmentioning
“…However, we found it convenient to adapt the procedure using the method of Tiecco and Testaferri [46]. Ligands 1, 2 and 3 were isolated in 19, 59 and 28% yields, respectively.…”
Section: Ligand Syntheses and Characterisationsmentioning
“…The optically active C 2 -symmetrical bipyridyl alcohols 5a and 5b were then prepared via Ni(0)-mediated homocoupling 7 in 52-55% yields. 7 Suzuki coupling of 7a with phenylboronic acid afforded ligand 2c in nearly quantitative yield. 8 The routes used for the synthesis of chiral ligands 3a-c and 4a-b are shown in Scheme 3, 2-methylpyridine, 2-phenyl-6-methylpyridine 8 and 2-methyquinoline were first lithiated with n-BuLi in ether at 0°C to give the corresponding organolithium, followed by trapping with chiral ketone 1a or 1b to produce compounds 3a-c and 4a-b in 53-83% yields.…”
Abstract-A series of new chiral ligands derived from D-fructose have been synthesized and applied in the enantioselective addition of diethylzinc to aldehydes. Comparison of the enantioselectivities obtained with these ligands demonstrated that the catalytic properties are highly dependent upon the structure of ligands, a rational explanation of the structural effects on the catalytic properties is provided.
“…(I) was obtained by heating 1,1'-biisoquinoline (Tiecco, Testaferri, Tingoli, Chianelli & Montanucci, 1984) and a large excess of 1,2-dibromoethane around 373 K. (II) was synthesized by a similar procedure using 1,3-dibromopropane.…”
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.