Process-Scale Total Synthesis of Nature-Identical (−)-(S,S)-7-Hydroxycalamenal in High Enantiomeric Purity through Catalytic Enantioselective Hydrogenation
A process-scale stereoselective synthesis of nature-identical (−)-(S,S)-7-hydroxycalamenal (=(−)-(5S,8S)-5,6,7,8-tetrahydro-3-hydroxy-5-methyl-8-(1-methylethyl)naphthalene-2-carbaldehyde; (−)-1a) in 96% enantiomeric excess (ee) with the aid of chiral Ru complexes has been developed. The key step was the enantioselective hydrogenation of easily accessible 2-(4-methoxyphenyl)-3-methylbut-2-enoic acid
AHMAR, M.;GIRARD, C.;BLOCH, R., TETRAHEDRON LETT., 30,(1989) N0, C. 7053-7056
作者:AHMAR, M.、GIRARD, C.、BLOCH, R.
DOI:——
日期:——
Iridium-Catalyzed Enantioselective Hydrogenation of α,β-Unsaturated Carboxylic Acids with Tetrasubstituted Olefins
作者:Song Song、Shou-Fei Zhu、Yu Li、Qi-Lin Zhou
DOI:10.1021/ol401593a
日期:2013.7.19
A highly efficient asymmetrichydrogenation of α,β-unsaturatedcarboxylicacids with tetrasubstituted olefin catalyzed by chiral spiro iridium complexes has been developed for the preparation of chiral α-substituted carboxylicacids in excellent enantioselectivities (up to 99% ee).