... Synlett 2002(9 ... [9] The fact that a ... The required Z-vinyl bromide precursor 20 was prepared in a similar manner to pyrrolidinone 16, but using the bromophosphonate (EtO) 2 P(O)CHBrCO 2 Et [13] in the Horner-Wadsworth-Emmons step (Scheme [5] ). Following reaction of 20 with ...