provided herein are compounds , compositions containing the compounds , and methods for the treatment of cancer in a cancer patient . in particular , the compounds are made by a process comprising treating a first compound represented by either formula g ′ or formula m ′: with a second compound of generalized formula r 8 r 9 c 2 and an acid selected from the group consisting of camphor sulfonic acid , p - toluene sulfonic acid , hydrochloric acid and acetic acid , wherein r 1 and r 2 are each selected from h , an alkyl group , an olefinic group , an aromatic group , an o - alkyl group , an o - olefinic group , or an o - aromatic group ; r 7 is an alkyl group , an olefinic group , or an aromatic group ; p 1 is a hydroxyl protecting group ; p 5 is h or an acid labile protecting group at the 7 - o position ; r 8 is h , alkyl group , olefinic or aromatic group ; and r 9 is : h , alkyl group , olefinic or aromatic or is as defined in the specification .