The tetracycline class of antibiotics has played a major role in the treatment of infectious diseases for the past 50 years. However, the increased use of the tetracyclines in human and veterinary medicine has led to resistance among many organisms previously susceptible to tetracycline antibiotics. The recent development of a modular synthesis of tetracycline analogs through a chiral enone intermediate has allowed for the efficient synthesis of novel tetracycline analogs never prepared before. The present invention provides a more efficient route for preparing the enone intermediate.
Process Research and Development of an Enantiomerically Enriched Allyic Amine, One of the Key Intermediates for the Manufacture of Synthetic Tetracyclines
作者:Wu-Yan Zhang、Philip C. Hogan、Chi-Li Chen、John Niu、Zhimin Wang、Danny Lafrance、Olga Gilicky、Nicholas Dunwoody、Magnus Ronn
DOI:10.1021/acs.oprd.5b00274
日期:2015.11.20
A robust, cost-effective, and high yielding Manufacturing process for enantiomerically enriched (S)-allylic amine 3, a key intermediate for fully synthetic tetracyclines have been developed. Two-novel and scalable asymmetric vinylations resulting high-to-excellent stereoselectivity have been developed for the key step. The final product is purified by an efficient Crystallization of a L-tartaric salt. The process described has been used to manufacture similar to 350 kg of the tartaric salt of 3 With 99.0% ee in 8 steps (35% overall yield) from cheap and readily available dimethyl maleate.