68330-73-4Relevant academic research and scientific papers
Conversion of γ- and δ-Keto Esters into Optically Active Lactams. Transaminases in Cascade Processes
Mourelle-Insua, ángela,Zampieri, Luiz Arthur,Lavandera, Iván,Gotor-Fernández, Vicente
supporting information, p. 686 - 695 (2018/02/21)
A one-pot two-step enzymatic strategy has been designed for the production of optically active γ- and δ-lactams in aqueous medium under mild conditions. The approach is based on the biotransamination of ethyl or methyl keto esters bearing different alkyl or aryl substitution patterns at α-position to the ketone functionality. In this manner, the keto esters were transformed into the corresponding amino esters with excellent conversions, which underwent spontaneous cyclisation in the reaction medium without addition of external reagents. Depending on the transaminase selectivity, both lactam enantiomers can be obtained, so initial enzyme screenings were performed using commercially available and made in house enzymes. Reaction conditions were optimised focusing on the substrate concentration, temperature and ratio of amine donor vs acceptor. Thus, ten γ- and δ-lactams were obtained in good to high isolated yields (70–90%) and excellent selectivities (94–99%) after one or two days at 30 or 45 °C. (Figure presented.).
A practical procedure for the removal of the phenylethanol moiety from phenylglycinol-derived lactams
Semak, Vladislav,Escolano, Carmen,Arroniz, Carlos,Bosch, Joan,Amat, Mercedes
experimental part, p. 2542 - 2549 (2011/02/22)
Chiral non-racemic bicyclic lactams derived from phenylglycinol have been appointed as key building blocks for the preparation of enantiopure nitrogen compounds. The removal of the chiral inductor leading to substituted piperidones by using air or oxygen
Resolution of α-aminolactams by inclusion complexation with chiral host compounds
Urbanczyk-Lipkowska, Zofia,Fukuda, Noriaki,Tanaka, Koichi
, p. 1254 - 1256 (2008/02/12)
3-Aminopiperidin-2-one and α-amino-ε-caprolactam were efficiently resolved by inclusion complexation with a chiral host compound, (R,R)-(-)-trans-4,5-bis(hydroxydiphenylmethyl)-1,4-dioxaspiro[4.5]decane . The amino substituent on the lactam ring was found to play an important role in efficient chiral recognition in the inclusion crystals.
