The Development of Practical Synthetic Routes to a CB<sub>2</sub> Agonist: Efficient Construction of a Densely Substituted Purine Core
作者:Amy C. DeBaillie、Chauncey D. Jones、Michael E. Laurila、Nicholas A. Magnus、Michael A. Staszak
DOI:10.1021/op300278c
日期:2013.2.15
An efficient and scalable process for the preparation of a purine-based CB2 agonist was developed. The production route to the requisite purine core relies on N-acylation and sequential substitution of a 5-amino-4,6-dichloropyrimidine with two amine building blocks followed by a cyclocondensation reaction. The chemistry was successfully employed to rapidly prepare over S kg of the active pharmaceutical ingredient. To further improve efficiencies, postproduction development resulted in a rearranged synthesis which reduced the need for pressure reactors and introduced the most costly reagent in the final step.