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Readily available pyridine‐ and quinoline‐ N ‐oxides as new organocatalysts for the enantioselective allylation of aromatic aldehydes with allyl(trichloro)silane
Author(s) -
Pignataro Luca,
Benaglia Maurizio,
Cinquini Mauro,
Cozzi Franco,
Celentano Giuseppe
Publication year - 2005
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20180
Subject(s) - chemistry , enantioselective synthesis , enantiopure drug , quinoline , pyridine , silane , catalysis , organic chemistry , stereoselectivity , yield (engineering) , materials science , metallurgy
The straightforward synthesis of a series of enantiomerically pure pyridine‐ and quinoline‐ N ‐oxides and their use as new organocatalysts for the enantioselective allylation of aromatic aldehydes with allyl(trichloro)silane is reported. The catalysts were readily assembled by combining commercially available enantiopure diamines with heterocyclic carboxylic acid N ‐oxides. The obtained compounds showed moderate to good chemical efficiency (up to 73% chemical yield) and satisfactory stereoselectivity (up to 50% ee). Tentative models of stereoselection were proposed to account for the stereochemical outcome of the reaction and to explain how the structural features of the catalyst control the stereoselctivity. Chirality 17:396–403, 2005. © 2005 Wiley‐Liss, Inc.