作者:Jr-Sheng Bau、I-Chia Chen、Zhen-Xing Yanga、Jia-Liang Zhu
DOI:10.1002/jccs.201200508
日期:2013.5
Acyclic α,α‐disubstituted β‐phosphonyl esters containing chiral alcoholic auxiliaries were efficiently prepared and evaluated for the lithium naphthalenide‐mediated asymmetric reductive alkylation. Among which, the best diastereoselectivity was received from the substrates bearing a (−)‐phenylmenthyl group in leading to alkylated esters with up to 83:17 dr. The diastereoselectivity is proven to be
高效制备了含有手性醇助剂的无环α,α-二取代的β-膦酰基酯,并进行了萘锂介导的不对称还原烷基化反应的评估。其中,最佳的非对映选择性是从带有(-)-苯基薄荷基的底物中获得的,从而导致烷基化酯的酯含量高达83:17 dr。事实证明,非对映选择性是由手性酯产生的π-表面差异以及由C-P键的还原性裂解产生的四取代烯酸酯的几何形状所控制。