Diastereomeric P,N-bidentate amidophosphites based on (S,S)- and (R,R)-hydrobenzoin as ligands in the Pd-catalyzed asymmetric allylation
作者:K. N. Gavrilov、I. V. Chuchelkin、S. V. Zheglov、N. N. Groshkin、I. M. Novikov、E. A. Rastorguev、V. A. Davankov
DOI:10.1007/s11172-011-0314-5
日期:2011.10
New P,N-bidentate diastereomeric amidophosphite ligands were obtained by phosphorylation of (S)-2-[(phenylamino)methyl]pyrrolidine involving (4S,5S)- and (4R,5R)-2-chloro-4,5-diphenyl-1,3,2-dioxaphospholanes. Their efficiency in the Pd-catalyzed enantioselective allylic substitution was compared, it was found that the reaction involving (E)-1,3-diphenylallyl acetate and pyrrolidine gives up to 75% ee.
通过(S)-2-[(苯基氨基)甲基]吡咯烷与(4S,5S)-和(4R,5R)-2-氯-4,5-二苯基-1,3,2-二氧磷杂环戊烷的磷酸化反应,获得了新的 P,N-同位非对映异构亚磷酸配体。比较了它们在 Pd 催化的对映体选择性烯丙基取代反应中的效率,发现涉及 (E)-1,3 二甲基二苯基乙酸酯和吡咯烷的反应ee高达 75%。