Efficient Synthesis of Trifluoromethyl and Related Trisubstituted Alkene Dipeptide Isosteres by Palladium-Catalyzed Carbonylation of Amino Acid Derived Allylic Carbonates
作者:Eriko Inokuchi、Tetsuo Narumi、Ayumu Niida、Kazuya Kobayashi、Kenji Tomita、Shinya Oishi、Hiroaki Ohno、Nobutaka Fujii
DOI:10.1021/jo702318d
日期:2008.5.1
A novel stereoselective synthetic approach to (Z)-trifluoromethylalkene dipeptide isosteres (CF3-ADIs) is described. Starting from readily available N-Boc-l-phenylalanine, Phe-Gly type CF3-ADIs were obtained through palladium-catalyzed carbonylation of allylic carbonates under CO. While the reaction of N-Boc derivatives proceeds in excellent yields but lower stereoselectivity (E:Z = 62:38–43:57), the
描述了一种新颖的立体选择性合成方法,用于(Z)-三氟甲基烯烃二肽等排体(CF 3 -ADIs)。从易于获得的N -Boc - 1-苯基丙氨酸开始,Phe-Gly型CF 3 -ADIs是通过钯在CO下钯催化的烯丙基碳酸酯羰基化而得到的。虽然N -Boc衍生物的反应收率很高,但立体选择性较低(E:Z = 62:38–43:57),N,N -diBoc衍生物的反应仅提供所需的(Z异构体,产率61%。我们还提出了通过钯催化的羰基化的几个Phe-Gly型三取代的烯烃二肽等排异构体的高度立体选择性合成。