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Effect of achiral and mixed chiral ligands on the asymmetric synthesis of γ-nitrophosphonates via Michael addition
被引:12
|作者:
Rai, Vishal
[1
]
Namboothiri, Irishi N. N.
[1
]
机构:
[1] Indian Inst Technol, Dept Chem, Bombay 400076, Maharashtra, India
关键词:
D O I:
10.1016/j.tetasy.2008.03.006
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
Changes in the diastereo- and/or enantioselectivity were observed when the Li-cinchonine catalyzed conjugate addition of phosphonates to nitroalkenes was carried out in the presence of achiral/chiral additives. Although the conjugate addition in the absence of such additives proceeded in better yields and selectivities as reported previously, the dramatic change in selectivity in the presence of additives provides an opportunity to synthesize different stereoisomers of the product, gamma-nitrophosphonate, using primarily the same chiral source. (C) 2008 Elsevier Ltd. All rights reserved.
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页码:767 / 772
页数:6
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