Asymmetric hydrophosphylation of chiral N-phosphonyl imines provides an efficient approach to chiral α-amino phosphonates.
Asymmetric hydrophosphylation of chiral N-phosphonyl imines provides an efficient approach to chiral α-amino phosphonates.
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DOI:
10.1111/j.1747-0285.2010.01013.x
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发表时间:
2010-10
影响因子:
3
通讯作者:
Li G
中科院分区:
文献类型:
--
作者:
Kaur P;Wever W;Rajale T;Li G
Chiral N-phosphonylimines were found to react with lithium phosphites to provide various substituted chiral α-amino phosphonates in excellent yields (94–97%) and diastereoselectivities (93:7 to 99:1). The types of bases utilized for generating the nucleophile are crucial for the effectiveness of asymmetric induction. In addition, N,N-isopropyl group on chiral N-phosphonylimine auxilliary was proven to be superior to other protecting groups in controlling diastereoselectivity. The absolute configuration was unambiguously determined by converting a chiral α-amino phosphonate into its authentic N-Cbz derivative.
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