Diastereoselective Synthesis of cis-2,6-Disubstituted Perhydro-4-pyranones Using Elevated Pressure Hydrogenation
作者:Marko D. Mihovilovic、Helmut Spreitzer
DOI:10.1007/s00706-005-0317-8
日期:2005.7
A diastereoselective strategy for the synthesis of gamma-pyrons was developed, starting from the Mg diacetonedicarboxylate complex. Initial cyclization with suitable anhydrides or acid chlorides, followed by hydrolytic decarboxylation leads to 2,6-disubstituted pyrans. Elevated pressure hydrogenation using Pd/C affords the title compounds in high diastereoselectivity. Scope and limitations of the method are outlined on selected examples.