Enantioselective Addition of Sodium Bisulfite to Nitroalkenes. A Convenient Approach to Chiral Sulfonic Acids
作者:Ehsan Sheikhi、Narjes Rezaei、Alvaro Castilla、Amparo Sanz‐Marco、Carlos Vila、M. Carmen Muñoz、José R. Pedro、Gonzalo Blay
DOI:10.1002/ejoc.202101064
日期:2021.10.7
A bifunctional thiourea catalyzes the enantioselectiveaddition of sodium bisulfite to nitroalkenes to give chiral β-nitrosulfonic acids with good yields and enantiomeric excesses. The sulfonic acids can be converted into the corresponding esters by treatment with trimethyl orthoacetate.
An unprecedented enantioselectiveconjugateaddition reaction of sodium bisulfite to various nitrostyrenes occurred upon the influence of a bifunctional amino-thiourea organocatalyst; a strategy that opens a straightforward route to unprotected chiral taurine derivatives thanks to the reduction of the obtained β-nitroethanesulfonic acids into the corresponding amino derivatives.