An enantioselective approach to 4-Substituted Proline Scaffolds: synthesis of (S)-5-(Tert-Butoxy Carbonyl)-5-Azaspiro[2.4]heptane-6-Carboxylic acid
A catalytic and enantioselective preparation of the (S)-4-methyleneproline scaffold is described. The key reaction is a one-pot double allylic alkylation of an imine analogue of glycine in the presence of a chinchonidine-derived catalyst under phase transfer conditions. These 4-methylene substituted...
| Authors: | , , , , , , |
|---|---|
| Format: | article |
| Status: | Published version |
| Publication Date: | 2020 |
| Country: | España |
| Institution: | Universidad de Barcelona |
| Repository: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/172477 |
| Online Access: | https://hdl.handle.net/2445/172477 |
| Access Level: | Open access |
| Keyword: | Catàlisi Síntesi de fàrmacs Catalysis Drug synthesis |
| Summary: | A catalytic and enantioselective preparation of the (S)-4-methyleneproline scaffold is described. The key reaction is a one-pot double allylic alkylation of an imine analogue of glycine in the presence of a chinchonidine-derived catalyst under phase transfer conditions. These 4-methylene substituted proline derivatives are versatile starting materials often used in medicinal chemistry. In particular, we have transformed tert-butyl (S)-4-methyleneprolinate (12) into the N-Boc-protected 5-azaspiro[2.4]heptane-6-carboxylic acid (1), a key element in the industrial synthesis of antiviral ledipasvir. |
|---|