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Enantioselective oxazaborolidinium-catalyzed Diels-Alder reactions without CH••••O hydrogen bonding
被引:34
作者:
Paddon-Row, Michael N.
[1
]
Kwan, Laurence C. H.
[2
]
Willis, Anthony C.
[2
]
Sherburn, Michael S.
[2
]
机构:
[1] Univ New S Wales, Sch Chem, Sydney, NSW 2052, Australia
[2] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia
关键词:
asymmetric catalysis;
density functional calculations;
Lewis acids;
Lewis bases;
transition states;
D O I:
10.1002/anie.200802002
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
(Chemical Equation Presented) All cis-tems go! The first detailed computational investigations into the title reaction validate Corey's two pre-transition-state models and reveal a third Lewis acid coordination mode (see picture), which operates for esters having s-cis C=C-C=O groups. The new pre-transition-state model explains the unexpected enantioselectivity witnessed for several Diels-Alder reactions and does not involve a C-H⋯O hydrogen bond. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.
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页码:7013 / 7017
页数:5
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