Ruthenium(II) in ring closing metathesis for the stereoselective preparation of cyclic 1-amino-1-carboxylic acids
作者:Kristin Hammer、Kjell Undheim
DOI:10.1016/s0040-4020(96)01132-5
日期:1997.2
Stereoselective synthesis of α-amino acids where the α-carbon of the amino acid is incorporated into a five-, six- or seven-membered ring is described. The stereoselective control results from stepwise bisalkenylation of (R)-2,5-dihydro-3,6-dimethoxy-2-isopropylpyrazine. Ring closing metathesis was effected by ruthenium(II)-catalysis. The spiro-cycloalkene intermediates were further transformed into
描述了α-氨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。立体选择性对照是由(R)-2,5-二氢-3,6-二甲氧基-2-异丙基吡嗪的逐步双烯基化产生的。闭环易位是通过钌(II)催化实现的。螺环烯烃中间体进一步转化成1 -aminocycloalkene- 1个通过弱酸水解羧酸衍生物。