An Efficient Scalable Route for the Synthesis of Enantiomerically Pure <i>tert</i>-Butyl-(1<i>R</i>,4<i>S</i>,6<i>R</i>)-4-(hydroxymethyl)-3-azabicyclo[4.1.0]heptane-3-carboxylate
                                
                                    
                                        作者:William M. Maton、Federica Stazi、Angelo Maria Manzo、Roberta Pachera、Arianna Ribecai、Paolo Stabile、Alcide Perboni、Nicola Giubellina、Fernando Bravo、Damiano Castoldi、Stefano Provera、Lucilla Turco、Simon Bryant、Pieter Westerduin、Roberto Profeta、Arnaldo Nalin、Emanuele Miserazzi、Simone Spada、Anna Mingardi、Mario Mattioli、Daniele Andreotti                                    
                                    
                                        DOI:10.1021/op100164v
                                    
                                    
                                        日期:2010.9.17
                                    
                                    An efficient scalable route to synthesize the enantiomerically pure tert-butyl-(1R,4S,6R)-4-(hydrox)methyl)-3-azabicyclo[4.1.0]heptane-3-carboxylate is described. Compared to the original routes, significant improvements were made by using an innovative approach starting from commercially available chiral lactone. In this approach, one of the key steps described is an elegant epimerization/hydrolysis of the undesired diastereoisomer avoiding tedious purification. The chemistry has been scaled up to produce kilogram amounts of tert-butyl-(1R,4S,6R)-4-(hydroxymethyl)-3azabicyclo[4.1.0]heptane-3-carboxylate in 43% yield over nine chemical transformations.