Patent ID: 8624051

Claim:
A process for the preparation of compounds of general formula 1 in which R 1 is a linear or branched (C1-C6)-alky group, an unsubstituted or substituted aryl or heteroaryl group, R 2 is a linear or branched (C1-C6)-alky group, an arylalkyl group); R 3 is H, a (C1-C4)-alkyl group, comprising: reacting a silylenolester of general formula 3, where R 4 is Me, Et and R 5 is Me, Et with an imine of general formula 4 where R 1 is a linear or branched (C1-C6)-alky group, an arylalkyl group, an unsubstituted or substituted aryl group, a heteroaryl group, R 2 is a linear or branched (C1-C6)-alky group or an arylalkyl group to obtain intermediates of general formula (3R*,5S*,6S*,1′S*)-5 and (3R*,5S*,6S*,1′R*)-6; and alcoholyzing or hydrolyzing the obtained intermediates of general formula (3R*,5S*,6S*,1′S*)-5 and (3R*,5S*,6S*,1′R*)-6 where R 1 is a linear or branched (C1-C6)-alky group, an arylalkyl group, an unsubstituted or substituted aryl group, a heteroaryl group; R 2 is a linear or branched (C1-C6)-alky group, an arylalkyl group; R 4 is a Me or Et group