PdII-Catalyzed Cascade Reaction with 1,3-Chirality Transfer; Stereoselective Synthesis of Chiral Nonracemic 2,2′-THF−THF Ring Units
摘要:
A Pd-II-catalyzed cascade reaction of chiral nonracemic allylic alcohols possessing an internal mono- or diepoxide and a terminal alcohol provided a contiguous THF-THF ring unit stereospecifically. The cyclization takes place in a 5-exo-tet-5-exo-trig fashion with high chirality transfer through a syn-S(N)2' like process for the formation of the internal THF ring. Chiral bis- and tris-THF-THF ring units were effectively prepared from acyclic precursors by the Pd-catalyzed reaction.
The PdII-catalyzed tandem cyclization of chiral allylic alcohols possessing an internal epoxide and a terminal alcohol provided a contiguous THF–THP and THF–THP ring units stereospecifically. The cyclizations take place via a 5-exo-tet-5-exo-trig mode, however, the cyclization of methyl substituted epoxy diols proceeded via 6-endo-tet-6-exo-trig fashion in a part to construct the oxygen-fused THP–THP
Kanbayashi, Naoya; Onitsuka, Kiyotaka, Journal of the American Chemical Society, 2010, vol. 132, p. 1206 - 1207
作者:Kanbayashi, Naoya、Onitsuka, Kiyotaka
DOI:——
日期:——
Kinetic Resolution and Unusual Regioselectivity in Palladium-Catalyzed Allylic Alkylations with a Chiral P,S Ligand
作者:J. W. Faller、Jeremy C. Wilt、Jonathan Parr
DOI:10.1021/ol0497382
日期:2004.4.1
Effective kinetic resolutions of acyclic allylic acetates and benzoates have been obtained using a palladium/(S)-BINAP(S) catalyst system. Unusually large preferences for the formation of branched alkylation products from 3-but-2-enyl and crotyl substrates have been observed.
The effect of catechin derivatives on the enantioselectivity of lipase-catalyzed hydrolyses of alkynol benzoate esters
作者:Kaoru Nakamura、Keishi Takenaka
DOI:10.1016/s0957-4166(02)00121-0
日期:2002.3
Polyphenols. such as (+)-catechin and pyrogallol could be used to enhance stereochemical control in the lipase-catalyzed hydrolysis of alkynol benzoate esters, leading to increased enantioselectivities in the kinetic resolution of alkynols with lipase, Amano AH. (C) 2002 Elsevier Science Ltd. All rights reserved.
ASAMI MASATOSHI; KIRIHARA HIROTO, CHEM. LETT.,(1987) N 2, 389-392