Pyrethrin I: spot the stereochemistry flaw

2,5-Dimethyl-2,4-hexadiene plus ethyl diazoacetate with a Cu(acac)2 catalyst, toluene, 80 C, 6 hours. Drawn with the carboxylate and the dimethylvinyl on opposite faces of the cyclopropane.

Transesterification with the pyrethrolone alcohol to deliver pyrethrin I. The drawn end product silently redraws to the natural diastereomer; the planted error is upstream.