Hydroxylation of and halogen addition to the carbon carbon double bond of ()-2-hydroxy-3-enoic acids
作者:Hongtao Yu、Helmut Simon
DOI:10.1016/s0040-4020(01)86507-8
日期:1991.11
Various ()-2-hydroxy-3-enoic acids and their derivatives have been subjected to epoxidations with peracids, dihydroxylations with osmiumtetroxide or methylrhenium trioxide. Depending on the derivatives and reagents applied, the diastereomeric excesses (de) achieved were in the range of 8–80%. Based on the different addition mechanisms of osmiumtetroxide and methylrhenium trioxide, all four possible
Asymmetric 1,2‐Carbamoyl Rearrangement of Lithiated Chiral Oxazolidine Carbamates and Diastereoselective Synthesis of α‐Hydroxy Amides
作者:Arun K. Ghosh、Amartyo J. Basu、Che‐Sheng Hsu、Monika Yadav
DOI:10.1002/chem.202200941
日期:2022.8
Asymmetric 1,2-carbamoyl rearrangement of chiral 2-alkenyl oxazolidine carbamates were investigated. These rearrangements provided α-hydroxy amide derivatives with excellent diastereoselectivity and in good to excellent isolated yields. The substrate scope of the reaction was examined with a variety of 2-alkenyl and benzyl oxazolidine carbamates. The observed high degree of diastereoselectivity was