Catalytic Asymmetric Syntheses of Tyrosine Surrogates
摘要:
Amino acid esters 5-11 as tyrosine mimics have been synthesized in excellent enantioselectivity (up to 99.6% ee) and in good overall chemical yields. The key step in the sequence was the Burk's [Rh(COD)(2R,5R)-Et-DuPhos]BF(4)-catalyzed asymmetric hydrogenation of enamides with a variety of reactive functional groups.
Catalytic Asymmetric Syntheses of Tyrosine Surrogates
作者:Xiaojun Han、Rita L. Civiello、Haiquang Fang、Dedong Wu、Qi Gao、Prasad V. Chaturvedula、John E. Macor、Gene M. Dubowchik
DOI:10.1021/jo801577t
日期:2008.11.7
Amino acid esters 5-11 as tyrosine mimics have been synthesized in excellent enantioselectivity (up to 99.6% ee) and in good overall chemical yields. The key step in the sequence was the Burk's [Rh(COD)(2R,5R)-Et-DuPhos]BF(4)-catalyzed asymmetric hydrogenation of enamides with a variety of reactive functional groups.