There are a couple of TR's out there for this compound, and a brief mention in Tihkal under the 5-meo-det entry, but it does not sound even remotely promising.
Erowid TR's>
http://www.erowid.org/experiences/subs/exp_5MeODPT.shtml
Tihkal quote> "To me, an obvious bridge to help explain this seeming discontinuity, would be the dipropyl analogue, I made the compound, and explored it up to its active levels. It is an easy compound to make, and has been known in the scientific literature for may years. My quandary was how to present it in this book. Should I make it a recipe in its own rights, giving the detailed synthesis and a formal position as an active tryptamine? But its actions are ambiguous, and not totally positive, making an argument for its inclusion as a footnote in some other, more interesting recipe. It is this latter route that I have chosen, so here is the 5-MeO-DPT story, both chemical and pharmacological, tucked away in the bigger 5-MeO-DET
CHEMISTRY : To a warm solution of 0.9 g 5-methoxytryptamine in 10 mL isopropanol there was added 2.8 mL diisopropylethylamine and 1.5 mL propyl iodide, and the mixture was heated on the steam bath for 5 h. TLC analysis at this time showed the presence of both the mono- and the dialkylamines, but there was no indication of the presence of unreacted 5-methoxytryptamine or of the quaternary salt. After removal of the volatiles under vacuum, a CH2Cl2 solution of the residue was treated with 1 g acetic anhydride (on the steam bath for 5 min) followed by 2 mL ammonium hydroxide. Extraction of this solution with 1 N H2SO4 proved to be almost worthless, as the extracts after separation, alkalinification with 6 N NaOH, extraction with CH2Cl2 and distillation of the residues following removal of the solvent, provided only a few milligrams of the desired product. The product had remained in the CH2Cl2. The solvent was removed under vacuum, and the residue partitioned between methanol (containing a small amount of aqueous NaOH) and hexane. The hexane fraction was concentrated under vacuum to provide 0.54 g of an almost colorless oil which was distilled by KugelRohr. A white oil was obtained, boiling at 170-180 °C at 0.04 mm / Hg which weighed 0.49 g. This was dissolved in 2.5 mL isopropanol and neutralized with 8 drops of concentrated HCl. The solution was diluted with 25 mL anhydrous Et2O to provide 5-methoxy-N,N-dipropyltryptamine hydrochloride as a white crystalline salt. This was removed by filtration, washed with Et2O, air dried to constant weight, and weighed 0.54 g. The mp was 193-194 °C. IR (in cm-1): 811, 828, 929, 1079, 1103, 1186. MS (in m/z): C7H16N+ 114 (100%); methoxyindolemethylene+ 160 (13%); parent ion 274 (3%).
QUALITATIVE COMMENTS : (with 4.0 mg, orally) "Within the hour there is something and after another hour there is nothing. Happy to go on up."
(with 6.0 mg, orally) "I am up above background for sure. Maybe to a ++, erotic maybe, and not too much light-headedness. It is comfortable. Completely out before the fourth hour."
(with 8.4 mg, orally) "Aware in 12 minutes, some head noises at 20 minutes. These noises are reminiscent of the 5-MeO-DET in that they were "bells" which were bad and the underlying "turn-on" which was good. But the "bells" were outweighing the "turn-on." Let's ride it out but then, for that matter, what choice is there! At the 25 minute point the turn-on now outweighs the bell noise. But these keep alternating. Pulse 84; no cardiovascular. But for the next half hour, the bells > the turn-on. At three hours, almost baseline, and I eat modestly. I have better things to do with my time."
I'd definitely be interested in hearing more on 4-ho/aco-dpt though
