There have been few reports on synthetic methods for cis-1, 2-diaminocyclohexane bearing a third ring substituent. Starting from 3-cyclohexenecarboxylic acid, we developed efficient methods for synthesizing the 3, 4-diaminocyclohexanecarboxylic acid derivatives 2–5. We also evaluated their anti-Xa and anticoagulant activities. Among the compounds, acid 2a and amide 2b exhibited the most potent in vitro anti-fXa activity, indicating that the position ...