A General Catalytic Method for Highly Cost‐ and Atom‐Efficient Nucleophilic Substitutions
作者:Peter H. Huy、Isabel Filbrich
DOI:10.1002/chem.201800588
日期:2018.5.23
A general formamide‐catalyzed protocol for the efficient transformation of alcohols into alkyl chlorides, which is promoted by substoichiometric amounts (down to 34 mol %) of inexpensive trichlorotriazine (TCT), is introduced. This is the first example of a TCT‐mediated dihydroxychlorination of an OH‐containing substrate (e.g., alcohols and carboxylic acids) in which all three chlorine atoms of TCT
Chemoenzymatic Synthesis of Rivastigmine via Dynamic Kinetic Resolution as a Key Step
作者:Kiwon Han、Cheolwoo Kim、Jaiwook Park、Mahn-Joo Kim
DOI:10.1021/jo9027374
日期:2010.5.7
A practical and efficient procedure for the synthesis of rivastigmine was developed. This procedure includes dynamic kinetic resolution using a polymer-bound ruthenium complex and a lipase in combination as a key step. Enantiopure (-)-rivastigmine was obtained from commercially available 3'-hydroxyacetophenone via five steps in overall 57% yield.