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Author: Subject: Decarboxylation of AA's
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[*] posted on 18-12-2013 at 09:56


What would reduce an Amine, but not a Ketone? Sodium triacetoxyborohydride? Sodium cyanoborohydride?



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[*] posted on 18-12-2013 at 10:59


Quote: Originally posted by I Like Dots  
What would reduce an Amine, but not a Ketone? Sodium triacetoxyborohydride? Sodium cyanoborohydride?


.....reduce an amine to what?...solo




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[*] posted on 18-12-2013 at 12:38


I am not sure if "reduce" was the correct terminology, but I was meaning add an alkyl group to form a secondary or tertiary amine. a nucleophilic aliphatic substitution may be what im trying to say.



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[*] posted on 18-12-2013 at 13:27


....then look for methylation of amines to secondary or tertiary whichever you are seeking on google.....or here on the search function ....solo



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[*] posted on 18-12-2013 at 13:50


Then you want to reduce an imine or an enamine intermediate.

And yes, sodium cyanoborohydride is the classical reagent for this and the reason why it is for example used in the MDA synthesis:
https://www.erowid.org/library/books_online/pihkal/pihkal100...

Trialkoxyborohydrides are the more modern versions.

But since you know these reagents and this is even detailed on their wikipedia page and there are reviews freely available on the net - why do you even ask?
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[*] posted on 18-12-2013 at 15:31


Quote: Originally posted by turd  
... why do you even ask?


Im getting to that :P

Znoble is trying to decarboxylate and alkylation using a one-pot approach. From what i've been reading decarboxylating in Acetophenone seems good due to its high boiling point and high conversion rate. But the high boiling point plus the fact it wont form a bisulfite addition makes purifying your amino acid hard.

Unless you could just drop in some sodium cyanoborohydride, and MeOH and call it a day.




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[*] posted on 19-12-2013 at 06:33


Quote: Originally posted by I Like Dots  
But the high boiling point plus the fact it wont form a bisulfite addition makes purifying your amino acid hard.

Unless you could just drop in some sodium cyanoborohydride, and MeOH and call it a day.

Please have the decency to at least read some basic level chemistry textbook before you clutter threads with nonsense. Or better yet, have the dignity of not posting on topics you don't have the slightest clue. Don't threat this forum as a trash bin.
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[*] posted on 19-12-2013 at 07:29


Oh, sorry. I was thinking of something I read, but I had the info wrong.
Anyway, I don't like how you make all these assumptions about me. I am interested, and I do try.
Don't you think that was a little harsh?

Anyway, I read http://www.sciencemadness.org/talk/viewthread.php?tid=23682 and wondered if you could use acetophenone instead of THF. But no, that's wrong because the formalin is not miscible with it.





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[*] posted on 19-12-2013 at 17:47


Dialkylated amino-acids CAN be decarboxylated. But, perhaps not by the means with which we are most familiar.

As I recall, the gas-gangrene bacteria can perform this little wonder easily. Though I may be recalling incorrectly.

Might try heating up such an amino-acid, under vacuum, just to see what happens. Since there are no hydrogens available on the amino function, amides cannot be formed. So, dialkylation should also prevent polymerization.
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[*] posted on 20-12-2013 at 08:22


Quote: Originally posted by zed  
Dialkylated amino-acids CAN be decarboxylated. But, perhaps not by the means with which we are most familiar.

As I recall, the gas-gangrene bacteria can perform this little wonder easily. Though I may be recalling incorrectly.

Might try heating up such an amino-acid, under vacuum, just to see what happens. Since there are no hydrogens available on the amino function, amides cannot be formed. So, dialkylation should also prevent polymerization.



......good idea I might just give it a shot, ....solo




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