(Member)
04-04-00 17:11
No 126930
(Rated as: good read)
Hello everyone, it's been a long while since I walked these hallowed halls, but I had an idea kind of spring itself upon me as I sat in the lab musing over a few synthetic papers...
http://rhodium.lycaeum.org/chemistry/it-
As everyone knows, the above link is to the synthesis of AMT located on Rhodium's page. Being more interested in synthetic chemistry than it's personal use, I wondered about a synthesis starting from that ubiquitous material Tryptophan.
Ok, here's the plan...
1) Reduction of Tryptophan or it's ester by the usual routes i.e. LiAlH4 or BH3/THF.
2) Elimination of that pesky alcohol group to it's corresponding methyl which takes us to our finished compound.
Ok, the first part is relatively simple, but what about the second? You can't reduce the group using standard methods, so how about these two papers which have definitely graced the Hive before...
1) Olah, G.A. et. al., J. Org. Chem., 44(8), 1979, pp 1247.
2) Sakai, T., et. al., Tet. Let., 28(33), 1987, pp 3817.
Both of these papers are different spins on Me3SiCl and NaI. The first turns the alcohol into a Iodide, and the second eliminates it all together. Both sets of reaction proceed at room temperature in good to excellant yield.
Three question therefore arise, 1) Can this chemistry be applied to indole containing system for the elimination of the slcohol, 2) what if any side-reactions may occur, and 3) if the iodide is isolated, what subsequent reaction can be used to eliminate that?
I leave these questions in your capable hands for further pondering...
Yours, as always...
Rhenium
(Member)
04-04-00 20:08
No 126931
Say, if memory serves, I think NaBH4/I2 as a reducing system is effective at facilitating the reduction of amino acids cheaply and effectively. I remember posting
------------------
-the good reverend drone
Ipsa scientia potestas est
(Chief Bee)
09-17-04 23:37
No 531846
(Rated as: excellent)
Synthesis of S(+)- and R(-)-3-(2-Aminopropyl)indole from Ethyl-D- and L-Tryptophanate
David B. Repke and Wilfred J. Ferguson
J. Heterocyclic Chem., 13, 775 (1976) (../rhodium/pdf /ethyl.trypto
Abstract
A stereospecific requirement for hallucinogenesis applies to certain molecules containing an asymmetric center. Thus, only the R-isomers of substituted phenylisopropylamines and lysergic acid diethylamide are psychotomimetic. The enantiomers of a minor hallucinogen, S(+)- and R(-)-3-(2-aminopropyl)indole (α-methyltryptamine) (6a and 6b) were synthesized via a 5-step manipulation from D- and L-tryptophan ethyl ester hydrochloride, respectively. Optical purity of these two isomers was determined by pmr spectroscopy of their complexes with a europium chiral shift reagent using the indole C2 H signal.
The Hive - Clandestine Chemists Without Borders
09-19-04 19:50
(Rated as: insignificant)
(Hive Bee)
09-21-04 03:54
No 532414
Surely that means that, by the above method, that phenylalanine can be converted into amphetamine, tyrosine to 4-hydroxyamphetamine and best of all DOPA to 3,4-dihydroxyamphetamine (then methylenation to MDA), and as phenolic OH groups don't undergo substitution reactions in the same way that aliphatic OH groups do, mean that they will be stable to reagents that convert the OH from reduction of the carboxylic acid to the intermediate iodo compound, or am I overlooking something simple (my area is pharmacology, with only a bit of org chem synth proceedures)?
That is right, the Mascara Snake: Fast and bulbous