Stereoselective Synthesis of .BETA.-Hydroxyphenylalanines Using Imino 1,2-Wittig Rearrangement of Hydroximates
作者:Okiko Miyata、Hiroshi Asai、Takeaki Naito
DOI:10.1248/cpb.53.355
日期:——
beta-hydroxy-alpha-amino acids. Upon treatment with LDA, hydroximates smoothly underwent the rearrangement to give Z-2-hydroxyoxime ethers in good yield, which were converted into both cis- and trans-oxazolidinones with high stereoselectivity. The cis- and trans-oxazolidinones were stereoselectively converted into erythro- and threo-beta-hydroxyphenylalanines, respectively, via the oxidative cleavage of a furan
含呋喃环的氢肟酸酯的亚氨基1,2-Wittig重排提供了一种合成β-羟基-α-氨基酸的新方法。用LDA处理后,氢肟酸酯平稳地进行重排,以高收率得到Z-2-羟基肟醚,将其以高的立体选择性转化为顺式和反式恶唑烷酮。通过呋喃环的氧化裂解,恶唑烷酮的开环和去保护作用,分别将顺式和反式恶唑烷酮立体选择性地转化为赤-和苏-β-羟基苯丙氨酸。