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Efficient syntheses of four stable-isotope labeled (1R)-menthyl (1S,2S)-(+)-2-phenylcyclopropanecarboxylates
被引:10
|作者:
Keliher, Edmund J.
[1
]
Burrell, Richard C.
[1
]
Chobanian, Harry R.
[1
]
Conkrite, Karina L.
[1
]
Shukla, Rajesh
[1
]
Baldwin, John E.
[1
]
机构:
[1] Syracuse Univ, Dept Chem, Syracuse, NY 13244 USA
关键词:
D O I:
10.1039/b605912k
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
Many carbenoid cyclopropanation reactions promoted by chiral catalysts give product mixtures reflecting impressive diastereo- and enantioselectivities. Few provide a single chiral product efficiently. This limitation has been overcome in cyclopropanations of styrene and isotopically labeled styrenes with alpha-diazoacetates. Convenient syntheses on a 20 g scale of each of four chiral isotopically labeled (1R)-menthyl(1S, 2S)-2-phenylcyclopropanecarboxylates ( the 1-d- 3-C-13,1,(3S)-d(2), 1,2,( 3S)-d(3), and 1,3,3-d(3) isotopomers) of better than 99% ee have been realized.
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页码:2777 / 2784
页数:8
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