C-2 dimethyl seco-mevinic acids. Synthesis of monocyclic HMG-CoA reductase inhibitors from (R)-(-)-carvone.
作者:Dinesh V. Patel、Robert J. Schmidt、Eric M. Gordon
DOI:10.1021/jo00052a031
日期:1992.12
An efficient preparation of novel monocyclic HMG-CoA reductase inhibitors from (R)-(-)-carvone is reported. Utilizing this chiral carbon pool, the C-2 dimethyl seco-mevinic acid 3a was prepared in 17 steps and 5.2 % overall yield. The key chiral intermediate aldehyde 10a was prepared via a short and efficient synthetic sequence (six steps, 27% yield) from (R)-(-)-carvone. The appropriate chirality of the diol acid side chain was secured by employing the chiral acetate synthon ''(S)-HYTRA'' and by performing a stereoselective 1,3-syn reduction on the beta-hydroxy ketone 19. Structural requirements at the C-2 position are rather stringent, and deletion of or addition of an extra methyl group are both unacceptable modifications for this novel class of monocyclic HMG-CoA reductase inhibitors.