Biocatalytic Friedel-Crafts Alkylation Using Non-natural Cofactors
作者:Harald Stecher、Martin Tengg、Bernhard J. Ueberbacher、Peter Remler、Helmut Schwab、Herfried Griengl、Mandana Gruber-Khadjawi
DOI:10.1002/anie.200905095
日期:2009.12.7
A novel biocatalytic protocol for CC bond formation is described and is an equivalent to Friedel–Craftsalkylation. S‐Adenosyl‐L‐methionine (SAM), the major methyl donor for biological methylation catalyzed by methyltransferases (Mtases), can perform alkylations (see scheme). These enzymes can accept non‐natural cofactors and transfer functionalities other than methyl onto aromatic substrates.
Synthesis of Proposed Oxidation−Cyclization−Methylation Intermediates of the Coumarin Antibiotic Biosynthetic Pathway
作者:Junhua Tao、Shanghui Hu、Michelle Pacholec、Christopher T. Walsh
DOI:10.1021/ol035101r
日期:2003.9.1
[structure: see text] A chemoenzymatic synthesis was described to prepare proposed oxidation-cyclization-methylation intermediates of the coumarin antibiotic biosynthetic pathway. The successful synthesis of these fragile molecules relies heavily on mild enzymatic deprotection and efficient enzymatic kinetic resolution to minimize epimerization, decomposition, multiple orthogonal protections, and retro