What amino acid is formed when the aldehyde used in the...

Key Concepts

Strecker Synthesis

The Strecker synthesis is a classical method for preparing ?-amino acids by reacting an aldehyde (or ketone) with ammonia (or an amine) and hydrogen cyanide. This reaction proceeds via the formation of an imine intermediate, which is then attacked by cyanide to form a nitrile. Subsequent hydrolysis of the nitrile affords an ?-amino acid. The process is significant as it links simple carbonyl compounds to biologically important amino acids.

Role of Aldehyde Structure in Determining the Amino Acid Product

In the Strecker synthesis, the structure of the aldehyde used directly determines the side chain (R group) of the resulting ?-amino acid. The carbon framework of the aldehyde becomes the carbon skeleton of the amino acid, which means that variations in the aldehyde (such as branching or length of the carbon chain) result in corresponding differences in the amino acid’s structure. This concept is critical for understanding how different amino acids can be synthesized from different aldehyde precursors.

Structure and Importance of ?-Amino Acids

?-Amino acids are organic compounds that contain both an amino group and a carboxylic acid group attached to the same carbon atom, known as the ?-carbon. Beyond serving as the building blocks of proteins, these molecules are integral to many biochemical pathways. The variation in the side chain (R group) among different ?-amino acids determines their properties and functions, making the study of their synthesis, such as via the Strecker method, fundamental in biochemistry and organic synthesis.

Transcript

00:01 Okay, for this question, it's really important to know what the mechanism is behind strickersynthesis.

00:09 And it's important also to know that stricter synthesis requires an aldehyde as the starting molecule, which makes sense as to why they're giving us three different aldehydes to predict which amino acids get formed.

00:27 So with that, let's go ahead and cover the strutelytide.

00:32 Stracker, synthesis, mechanism.

00:46 And again, this is a general mechanism that we're going to use to apply to the three aldehydes that we have.

00:57 So, i would...

01:11 Okay, pay, again, pay attention to the aldehyde.

01:14 So our generic aldehyde looks like this.

01:20 I'm actually going to draw in a different color, so we can keep track of what stays and what goes.

01:26 So our generic aldehyde looks like this.

01:32 Okay.

01:35 And this is our aldehyde.

01:38 Already.

01:39 So the first step of this mechanism is that we are going to add trace acid, trace amounts of acid, rather, and ammonia.

01:56 Okay.

01:58 So after doing that, we form what is called an immune to see how the oxygen gets replaced by a nitrogen and that reminds me let's make the changes in green so it means the nh of top again is our immune so the following step we treat it with carbon triple bonded to a nitrogen so the carbon is going to be negative recharge, and it's going to be treated with hydrochloric acid.

02:48 All right.

02:49 Now, that will give us.

02:53 So you'll notice that a lot changes after this step, right? so while our group stays the same, what changes is we now have a ch that's bonded to an amine group.

03:16 Amino group which is bonded to our carbon tube bonded to our nitrogen already and the final step is we're going to treat this with hcl water and heat which gives us our our group is the only thing that stays the same from the next or our group and ch and nh3 stay the same but this is how we get our carboxyl group for our amino acid okay and with that right here we have our generic amino acid okay so if you look through this from start to finish the only thing that stays the same is our r group right here.

04:42 R group, r group, r group.

04:46 So whatever molecules or solutions our aldehyde are immen are treated with, it's for more so the rest of the molecule instead of our r group.

05:01 So now, let's move on to our three different altadides.

05:07 So let's scroll down.

05:08 Not too much so we have the final amino acid form.

05:11 So our first aldehyde is acetyldehyde.

05:22 As a tautahed.

05:23 Al -daid...