Formation of multi-stereogenic centers using a catalytic diastereoselective Henry reaction
作者:Takayoshi Arai、Yoshinori Taneda、Yoko Endo
DOI:10.1039/c0cc03022h
日期:——
A diastereoselective Henry reaction of chiral aldehydes with nitroalkanes was developed using a chiral sulfonyldiamine (L1)-CuCl complex. The reaction of (R)-2-phenylpropanal and nitromethane was smoothly catalyzed by the (S,S,S)-L1-CuCl complex to give the adduct with 99/1 syn/anti selectivity in 99% ee. In the reaction of (S)-2-phenylpropanal and nitroethane, the (R,R,R)-L1-CuCl catalyst yielded
Enantioselective Synthesis of 4-Methyl-3,4-dihydroisocoumarin via Asymmetric Hydroformylation of Styrene Derivatives
作者:Bo Qu、Renchang Tan、Madison R. Herling、Nizar Haddad、Nelu Grinberg、Marisa C. Kozlowski、Xumu Zhang、Chris H. Senanayake
DOI:10.1021/acs.joc.8b02813
日期:2019.4.19
Enantioenriched aldehydes are produced through asymmetric hydroformylation of styrene derivatives using BIBOP-type ligands. The featured example is enantioselectivesynthesis of 4-methyl-3,4-dihydroisocoumarin, which was prepared in a 95.1:4.9 enantiomeric ratio from asymmetric hydroformylation of ethyl 2-vinylbenzoate followed by in situ lactonization during the reduction process. The conditions are