Drone and I had a quick convo about this about a month or so back (I was doing most of the listening, of course
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but basically, instead of making the phenylnitropropene intermediate which needs that nasty /watched/ precurser nitroethane, you make the nitrobutene using nitropropane...
with the former, you'd reduce the propene to MDA or MDP-2-P, but with the latter, you'd reduce the butene to make J (alpha-Ethyl-3,4-methylenedioxyphenethylamine; PiHKAL, pg 698.), or MDP-2-but...
Sources: drone's ramblings,
PiHKAL
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.x[ PLUR ]x.
halcyon; Kinetic Pharmaceuticals