@article{156fd2428a254a388c6d0bbc91cfe0f7,
title = "Enantioselective Diels-Alder reactions: Room temperature bis(oxazoline)-zinc, -magnesium, and -copper triflate catalysts",
abstract = "A series of chiral bis(oxazoline) ligands, differing in the length of the chain connecting the chiral oxazoline subunits and in the nature of the substituent at the chiral center, were examined in the room temperature Zn(OTf)2, Mg(OTf)2 and Cu(OTf)2 catalyzed reaction of N-crotonyloxazolidinone with cyclopentadiene. A 1,4-bis(oxazoline) ligand proved best for Zn(OTf)2 and afforded product consistent with reaction via an octahedral model, while 1,3-bis(oxazoline) ligands were best for Mg(OTf)2 and Cu(OTf)2.",
author = "Takacs, {James M.} and Lawson, {Edward C.} and Reno, {Michael J.} and Youngman, {Mark A.} and Quincy, {David A.}",
note = "Funding Information: Financial support of this work by the University of Nebraska Research Council and the National Institutes of Health is gratefully acknowledged. We thank the NIH (SIG 1-SI0-RR06301) and NSF (CHE-93000831) for instrumentation funding, Dr R. Shoemaker, Mr S. J. Mehrman and Ms D. Massey for carrying out variable temperature N-MR studies, Mr J. A. Dickmeyer and Mr R. V. Athalye for preparing some of the box ligands used in this study, Dr Charles Ross, II, for determining the crystal structure of \[(S) 5 (Rl=tert-Bu)ZnCl2\], Prof. M. Sibi for helpful discussions, and Prof. D. A. Evans for providing us with a preprint of his manuscript. 5",
year = "1997",
month = sep,
day = "25",
doi = "10.1016/S0957-4166(97)00322-4",
language = "English (US)",
volume = "8",
pages = "3073--3078",
journal = "Tetrahedron Asymmetry",
issn = "0957-4166",
publisher = "Elsevier Ltd",
number = "18",
}