Palladium-catalyzed intramolecular asymmetric hydroamination, hydroalkoxylation, and hydrocarbonation of alkynes.
A conceptually novel approach for asymmetric intramolecular hydroamination, hydroalkoxylation and hydrocarbonation of alkynes using chiral palladium catalysts are described. The reactions of the aminoalkynes 5, alkynols 7, and alkynylmethines 9 in the presence of Pd2(dba)3 x CHCl3/PhCOOH/renorphos 4 in benzene (or benzene-hexane) at 100 degrees C gave the corresponding cyclization products (nitrogen heterocycles 6, oxygen heterocycles 8, and carbocycles 10) in good yields with good enantioselectivities. The origins of enantioselectivities in the hydroamination reaction are discussed based on DFT computations.
Patil
Nitin T
NT
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
Lutete
Léopold Mpaka
LM
Wu
Huanyou
H
Pahadi
Nirmal K
NK
Gridnev
Ilya D
ID
Yamamoto
Yoshinori
Y