Chiral N-phosphonyl imine chemistry: asymmetric additions of ester enolates for the synthesis of beta-amino acids.
Chiral N-phosphonyl imine chemistry: asymmetric additions of ester enolates for the synthesis of beta-amino acids.
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手性 N-膦酰亚胺化学:酯烯醇化物的不对称加成用于合成 β-氨基酸。
DOI:
10.1111/j.1747-0285.2008.00682.x
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发表时间:
2008-08
影响因子:
3
通讯作者:
Li, Guigen
中科院分区:
文献类型:
--
作者:
Han, Jianlin;Ai, Teng;Nguyen, Thao;Li, Guigen
关键词:
Chiral phosphonyl imines attached by 1-naphthyl protection group were found to react with lithium ester enolates smoothly and give chiral β-amino esters in good yields (70−88%) and up to excellent diastereoselectivity (>99:1 dr). Triisopropoxytitanium (IV) chloride was found to enhance diastereoseletivity when used as the Lewis acid promoter. The chiral auxiliary can be readily removed by treating with HBr to give free amino esters. The absolute structure has been unambiguously determined by converting one of the products into an authentic sample. This reaction provides an easy access to β-amino acid derivatives.
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影响因子:
15
作者:
Bates, RB;Brusoe, KG;Bontems, R
通讯作者:
Bontems, R
影响因子:
3.2
作者:
Beddow, James E.;Davies, Stephen G.;Thomson, James E.
通讯作者:
Thomson, James E.
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15
作者:
Chi, Yonggui;Gellman, Samuel H.
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Gellman, Samuel H.
影响因子:
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作者:
Baldoli, C;DelButtero, P;Pilati, T
通讯作者:
Pilati, T
影响因子:
15
作者:
Chi, Yonggui;English, Emily P.;Gellman, Samuel H.
通讯作者:
Gellman, Samuel H.