of racemic β-halo-α-keto esters through carbonyl-enereaction were realized using a chiral N,N′-dioxide-nickel(II) complex, giving the corresponding β-halo-α-hydroxy esters containing two vicinal chiral tri- and tetrasubstituted carbon centers in good yields and dr with excellent ee values without the use of extra bases. Meanwhile, a proposed reactionmechanism was presented according to the configuration
Ketoreductase-catalyzed dynamic reductive kinetic resolution of sterically hindered 2-aryl-1,5-benzothiazepin-3,4(2H,5H)-diones: asymmetric synthesis of a key diltiazem precursor and its analogues
reductive kinetic resolution (DYRKR) is a versatile and appealing synthetic approach to access valuable chiral alcohols containing two or more stereocenters. Despite the considerable progress that has been made in this research field, previous studies mostly focused on ketone substrates with relatively simple structures. In the present study, ketoreductases YDR368w and YGL039w were identified through enzyme
Substituted Aralkyl Aldehydes: Preparation and Antitumor Evaluation
作者:John H. Billman、John A. Tonnis
DOI:10.1002/jps.2600600815
日期:1971.8
hydrocinnamaldehydes, and cinnamaldehydes—was prepared and tested for antitumor activity. The substituted phenylacetaldehydes were prepared from the corresponding benzaldehydes via the Darzenglycidicestersynthesis, followed by hydrolysis and decarboxylation. The dihydrocinnamaldehydes were prepared by the lead tetraacetate oxidation of the corresponding alcohols. The cinnamaldehydes were prepared