Hetero-substituted cyclic lactone analogues and uses thereof

Abstract

The present disclosure provides SL and SL derivatives comprising a polar substituent adjacent to the lactone ring. Additionally, the present disclosure provides methods of using the SL and SL derivatives to inhibit the growth of leukemic cancer cells.

What is claimed is: 
     
         1 . A method for inhibiting growth of a cancer cell derived from a blood cancer, the method comprising contacting the cancer cell with an effective amount of a composition comprising a compound of Formula (I) or a pharmaceutically acceptable salt thereof: 
       
         
           
           
               
               
           
         
         wherein: 
         X is selected from 
       
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2  and R 3  are independently selected from the group consisting of hydrogen, hydrocarbyl and substituted hydrocarbyl, wherein one or more of R 1 , R 2  and R 3  comprise a substituted hydrocarbyl comprising an atom selected from the group consisting of fluorine, oxygen, nitrogen, chlorine, bromine, and iodine;
 R 4  and R 5  are independently selected from the group consisting of hydrogen, hydrocarbyl and substituted hydrocarbyl; 
    is a single or double bond; and 
    is a SL ring structure from the class of germacranolides or heliangolides. 
 
     
     
         2 . The method of  claim 1 , wherein R 4  and R 5  are independently selected from the group consisting of hydrogen, —OCOCH 3 , alkoxy, hydroxyalkyl, carbonylalkyl, carbonyl substituted alkyl, carbonylalkoxy, carbonylaminoalkyl, alkyl, substituted alkyl, ester, substituted ester, alkenyl, substituted alkenyl, alkynyl and substituted alkynyl. 
     
     
         3 . The method of  claim 1 , wherein the lactone ring does not contain a double bond, comprises an α-methylene group and R 4  and R 5  are hydrogen. 
     
     
         4 . The method of  claim 1 , wherein the lactone ring contains a double bond, does not comprise an α-methylene group, R 4  is hydrogen and R 5  is selected from the group consisting of —OCOCH 3 , alkyl, substituted alkyl, ester and substituted ester. 
     
     
         5 . The method of  claim 1 , wherein the lactone ring contains a double bond, does not comprise an α-methylene group, R 4  is hydrogen and R 5  is OCOCH 3 . 
     
     
         6 . The method of  claim 1 , wherein the cancer cell is a leukemic cell. 
     
     
         7 . The method of  claim 1 , wherein the cancer cell is a cancer stem cell. 
     
     
         8 . The method of  claim 1 , wherein the compound of Formula (I) is calaxin.