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Enantioselective [2,3]-sigmatropic and [1,2]-Stevens rearrangements via intramolecular formation of allylic oxonium ylides catalyzed by chiral dirhodium(II) carboxylates
被引:61
作者:
Kitagaki, S
[1
]
Yanamoto, Y
[1
]
Tsutsui, H
[1
]
Anada, M
[1
]
Nakajima, M
[1
]
Hashimoto, S
[1
]
机构:
[1] Hokkaido Univ, Grad Sch Pharmaceut Sci, Sapporo, Hokkaido 0600812, Japan
关键词:
rhodium and compounds;
ylides;
rearrangements;
enantio-control;
diazo compounds;
D O I:
10.1016/S0040-4039(01)01282-5
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Tandem intramolecular generation and rearrangement of allylic oxonium ylides from oc-diazo P-keto esters has been effected with the aid of dirhodium(II) tetrakis[N-phthaloyl-(S)-tert-leucinate] in toluene, providing benzofuran-3-ones via [2,3]-sigmatropic rearrangement in up to 76% cc. In systems with crotyl and prenyl substituents, products arising from the less common [1,2]-Stevens rearrangement as a side reaction have also been obtained in up to 66% ee. It is suggested that competitive [2,3]- and [1,2]-rearrangements proceed through a common, chiral rhodium(II)-bound oxonium ylide intermediate. (C) 2001 Elsevier Science Ltd. All rights reserved.
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页码:6361 / 6364
页数:4
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