Ring-Closing Metathesis of Chiral Allylamines. Enantioselective Synthesis of (2<i>S</i>,3<i>R</i>,4<i>S</i>)-3,4-Dihydroxyproline
作者:Rubén Martín、Montserrat Alcón、Miquel A. Pericàs、Antoni Riera
DOI:10.1021/jo025832p
日期:2002.10.1
The ring-closing metathesis (RCM) of two types of unsaturated chiral allylamines III, easily available from enantiomerically enriched epoxy alcohols, has been studied. Fully protected allylamines IIIa [(1)R = CH(2)-(CH(2))(n)()-CH=CH(2); (2)R = Boc; (3)R = PMB] have been prepared from unsaturated epoxy alcohols, whereas bis-allylamines IIIb ((1)R = Ph, (2)R = allyl,(3)R = Boc or PMB) have been prepared
研究了两种容易从对映异构体富集的环氧醇中获得的不饱和手性烯丙胺III的闭环易位(RCM)。完全保护的烯丙胺IIIa [(1)R = CH(2)-(CH(2))(n)()-CH = CH(2); (2)R = Boc; (3)R = PMB]由不饱和环氧醇制备,而双烯丙基胺IIIb((1)R = Ph,(2)R =烯丙基,(3)R = Boc或PMB)已由2, 3-环氧-3-苯基丙醇。两种类型均已进行了RCM处理,以提供环状烯丙胺I或II。这些中间体的合成潜力已通过(2S,3R,4S)-3,4-二羟基脯氨酸的对映选择性合成得到证明。