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Two compounds that can prolong the replicative lifespan of yeast, geniposidic acid (Compound <b>1</b>) and geniposide (Compound <b>2</b>), were isolated from <i>Gardenia jasminoides</i> Ellis. Compared with Compound <b>1</b>, Compound <b>2</b> was different at C11 and showed better bioactivity. On this basis, seven new geniposidic derivatives (<b>3</b>–<b>9</b>) were synthesized. Geniposidic 4-isoamyl ester (<b>8</b>, GENI), which remarkably prolonged the replicative and chronological lifespans of K6001 yeast at 1 µM, was used as the lead compound. Autophagy and antioxidative stress were examined to clarify the antiaging mechanism of GENI. GENI increased the enzymes activities and gene expression levels of superoxide dismutase (SOD) and reduced the contents of reactive oxygen species (ROS) and malondialdehyde (MDA) to improve the survival rate of yeast under oxidative stress. In addition, GENI did not extend the replicative lifespan of ∆<i>sod1</i>, ∆<i>sod2</i>, ∆<i>uth1</i>, ∆<i>skn7</i>, ∆<i>cat</i>, and ∆<i>gpx</i> mutants with K6001 background. The free green fluorescent protein (GFP) signal from the cleavage of GFP-Atg8 was increased by GENI. The protein level of free GFP showed a considerable increase and was time-dependent. Furthermore, GENI failed to extend the replicative lifespans of ∆<i>atg32</i> and ∆<i>atg2</i> yeast mutants. These results indicated that antioxidative stress and autophagy induction were involved in the antiaging effect of GENI.