Synthesis of multifunctionalized phosphonic acid esters via opening of oxiranes and azetidinium salts with phosphoryl-substituted carbanions
作者:Agata Bakalarz-Jeziorna、Jan Heliński、Bożena Krawiecka
DOI:10.1039/b009720i
日期:——
Ring-opening of N,N-diethyl-3-benzyloxyazetidinium salt 1b and N,N-dibenzyl-2,3-epoxypropylamine 6 by phosphoryl-substituted carbanions generated from phosphonates 2a–e furnishes the multifunctional phosphonates 3a–e and 7a, 7b, 7e bearing the same carbon skeleton. The reaction of the heterocyclic electrophiles 1b and 6 with the P-allyl anion generated from 2f demonstrates the strong dependence of the α/γ-regioselectivity on the reaction conditions. Depending on the character of the electrophile and/or the reaction medium the regioselective synthesis of both α- and γ-regioisomers is realized.
N,N-二乙基-3-苄氧嘧啶盐1b和N,N-二苄基-2,3-环氧丙胺6通过由磷酸酯2a–e生成的磷酰基取代的卡宾阴离子进行开环反应,生成具有相同碳骨架的多功能磷酸酯3a–e和7a、7b、7e。带 heterocyclic 亲电试剂1b和6与从2f生成的P-盟阴离子的反应显示出α/γ-区位选择性对反应条件的强依赖性。根据亲电试剂和/或反应介质的特性,实现了α-和γ-区位异构体的区域选择性合成。