Natural products continue to provide the drug discovery community with a nearly endless variety of biologically active lead compounds from which to develop medicines targeted to specific disease states. As our ability to synthesize complex molecules increases, it becomes increasingly important to develop syntheses which are able to access more than just a single target. Instead, creating routes where entire families of compounds can be generated provides far more value and allows for the increased exploration of chemical space around a given scaffold. However, to achieve the site-specific and chemoselective transformations needed in such an approach, increasingly better tools for C-H functionalization are required. The proposed research will develop the first concise and scalable route for the general synthesis of diterpenoid alkaloids. This class of compounds, which includes the clinically approved lappaconitine, displays a wide range of biological activity including analgesic, anti-inflammatory, antiarrhythmic, anesthetic, antithermic, antiparasitic, and antifeedant properties. The ability to access large quantities of various natural and unnatural diterpenoid alkaloids would greatly facilitate analog development and the possibility of discovering novel therapeutic agents. The proposed research also includes the development of a practical and preparative, intermolecular Hofmann-Lffler-Freytag reaction. The successful development of this reaction would be immediately useful to scientists as it would allow for the controlled, regioselective C-H halogenation of unactivated alkanes, the products of which are valuable chemical intermediates in the synthesis of medicines and materials.
The proposed research plan details the development of a concise, scalable semisynthesis of a variety of diterpenoid alkaloids, a family of compounds which display a myriad of biological activities including analgesic, anti-inflammatory, antiarrhythmic, anesthetic, and antiparasitic properties. Additionally, a practical and preparative intermolecular Hofmann-Lffler-Freytag reaction will be developed. This will allow for the controlled, regioselective C-H halogenation of unactivated alkanes, the products of which are valuable chemical intermediates in the synthesis of medicines and materials.
| Lopchuk, Justin M; Fjelbye, Kasper; Kawamata, Yu et al. (2017) Strain-Release Heteroatom Functionalization: Development, Scope, and Stereospecificity. J Am Chem Soc 139:3209-3226 |
| Gianatassio, Ryan; Lopchuk, Justin M; Wang, Jie et al. (2016) Organic chemistry. Strain-release amination. Science 351:241-6 |
| Cherney, Emily C; Lopchuk, Justin M; Green, Jason C et al. (2014) A unified approach to ent-atisane diterpenes and related alkaloids: synthesis of (-)-methyl atisenoate, (-)-isoatisine, and the hetidine skeleton. J Am Chem Soc 136:12592-5 |
