The present invention relates to novel compounds useful as dipeptidyl peptidase IV (DPP-IV) inhibitors of the formula: ##STR00001## wherein X, Y, a, R.sup.1, and R.sup.2 are as defined herein.

 
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> Preparation of cis-fused 3,3a,8,12b-tetrahydro-2H-dibenzo[3,4:6,7]cyclohepta[1,2-b]furan derivatives
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