The invention describes novel malonates and a process for using said malonates for the preparation of chiral epoxides of formula 
having a cyclanic (1R) configuration, the group in position 2 having a transconfiguration and the epoxy group having a cis-configuration with respect to the substituent in position 1 and wherein R is an alkyl group from C1 to C4, linear or branched, and R1 is an alkyl or an alkenyl group from C2 to C8, linear or branched. The above process comprises the rearrangement of malonate (VII) to malonate (VI) and the decarboxylation reaction of 
into an ester of formula 
followed by the stereoselective epoxidation of the thus-obtained compound.
                            该发明描述了新颖的
丙二酸酯以及使用该
丙二酸酯制备具有环状(1R)构型的手性
环氧化物的过程,其中第2位的基团具有反式构型,环氧基相对于第1位取代基具有顺式构型,其中R是C1至C4的直链或支链烷基,R1是C2至C8的直链或支链烷基或烯基。上述过程包括将
丙二酸酯(VII)重排为
丙二酸酯(VI),并将其脱羧反应成为式的酯,然后对所得化合物进行立体选择性环氧化。