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Efficient routes have been developed for the synthesis of the trans-la
ctone 2, the trans-lactam 3 and their 3-substituted analogues based up
on cyclisation strategies using Mukaiyama's reagent. 3 beta-Allyl, thi
ophenyl and propyl lactones 5 inhibit chymotrypsin and human leucocyte
elastase and are representative of a novel class of serine protease i
nhibitors. (C) 1998 Elsevier Science Ltd. All rights reserved.