Quasi-biomimetic ring contraction promoted by a cysteine-based nucleophile: Total synthesis of Sch-642305, some analogs and their putative anti-HIV activities

Cysteine plays a number of important functional and structural roles in nature, often in the realm of catalysis. Herein, we present an example of a cysteine-promoted Rauhut-Currier reaction for a potentially biomimetic synthesis of Sch-642305 and related analogs. In this key step of the synthesis we discuss interesting new discoveries and the importance of substrate-catalyst recognition, as well as cysteine's structural features. Also, we investigate the activity of Sch-642305 and four analogs in HIV-infected T-cells.