The kinetic resolution of 13 racemic aliphatic 1,2-diols (rac-1a-m) by means of a lipase-catalyzed sequential acetylation was investigated. The enantioselectivity of the 3-aryloxy-propane-1,2-diols rac-1a-k depends on the substitution pattern at the aryl ring.
Kinetic resolution of acyclic 1,2-diols using a sequential lipase-catalyzed transesterification in organic solvents
A method for the kinetic resolution of 3-(aryloxy)-1,2-propanediols rac-1a-n without additional protection-deprotection steps using a lipase-catalyzed sequential transesterification with lipase amnno PS has been developed. In the first step of this one-pot procedure the racemic 1,2-diols are acylated regioselectively at the primary hydroxy group without enantioselection. The subsequent acylation at the secondary hydroxy group of the formed primary monoacetate is responsible for high enantioselection. The enantioselectivity of this transformation depends significantly on the substitution pattern of the aryl ring and the organic solvent used. 3-(Aryloxy)-1,2-propanediols with substituents in the para-position show a much higher enantioselectivity than the corresponding derivatives with ortho-substituents. Among other substrates, the pharmaceuticals Mephenesin, Guaifenesin, and Chlorphenesin have been resolved. The replacement of the aryloxy by alkyl substituent causes a dramatic decrease of enantioselectivity.
METHODS AND COMPOSITIONS FOR TREATING CANCER
申请人:Globavir BioSciences, Inc.
公开号:US20160361298A1
公开(公告)日:2016-12-15
Described are compositions and methods for treating cancer. Some methods comprise the administration of an effective amount of at least one inhibitor of tryptophan 2,3-dioxygenase (TDO) and/or indoleamine 2,3-dioxygenase (IDO), optionally combined with one or more additional anti-cancer agents.