Synthesis of conformationally restricted serine derivatives through ruthenium(II)-catalyzed ring closing metathesis
作者:Kristin Hammer、Kjell Undheim
DOI:10.1016/s0040-4020(97)00252-4
日期:1997.4
Stereoselective synthesis of α-amino-β-hydroxy acids where the α-carbon of the amino acid is incorporated into a five-, six- or seven-membered ring is described. The stereoselective control at the chiral auxiliary carbon results from stepwise alkenylation and aldol formation using metalated species of the chiral auxiliary (R)-2,5-dihydro-3,6-dimethoxy-2-isopropylpyrazine. Ring closing metathesis was
描述了α-氨基-β-羟基酸的立体选择性合成,其中氨基酸的α-碳结合到五元,六元或七元环中。在手性辅助碳上的立体选择性控制是通过使用手性辅助(R)-2,5-二氢-3,6-二甲氧基-2-异丙基吡嗪的金属化物质逐步进行烯基化和羟醛形成而产生的。闭环易位是通过钌(II)催化实现的。通过温和的酸水解将螺-环烯烃中间体转化为1-氨基-2-羟基环烯烃-1-羧酸衍生物。