Organic Chemistry Masterclass: Insanely complex neuroprotective Illisimonin A (+reaction mechanisms)

Ғылым және технология

⚠️ This video contains advanced organic chemistry!
Illisimonin A is the perfect quest for synthesis practicioners - it is bioactive (neurotrophic), structurally complex and highly oxygenated. This video will explain the isolation of this illicium-derived natural product and properties. Two modern syntheses (2019 and 2023) will be discussed, highlighting unique approaches and common methodologies to access this interesting target.
/ totalsynthesis
🚀 Thanks to all channel supporters!!!
/ totalsynthesis_official
👉 Follow me on Instagram to follow updates on other random chemistry research and interesting news!
www.total-synthesis.com
Please drop a like and comment to support the video's visibility, activate notifications and subscribe to the channel so you do not miss future videos!
00:00 Why we should care about illicium natural products
00:47 How it was discovered, isolated and characterized
01:40 The property that makes it exciting¨
02:49 Retrosynthetic analysis and key late-stage disconnections
04:53 Rychnovsky: First total synthesis (racemic) and structural revision
08:29 Kalesse: Asymmetric total synthesis
13:43 Closing remarks
Key references:
- Asymmetric Total Synthesis of Illisimonin A (J. Am. Chem. Soc. 2023, 145, 7021)
- Total Synthesis and Structure Revision of (−)-Illisimonin A, a Neuroprotective Sesquiterpenoid from the Fruits of Illicium simonsii (J. Am. Chem. Soc. 2019, 141, 13295)
- Illisimonin A, a Caged Sesquiterpenoid with a Tricyclo[5.2.1.01,6]decane Skeleton from the Fruits of Illicium simonsii (Org. Lett. 2017, 19, 6160)
- Other related publication: Synthesis of Illisimonin a Skeleton by Intramolecular Diels-Alder Reaction of Ortho-Benzoquinones and Biomimetic Skeletal Rearrangement of Allo-Cedranes (Organics 2021, 2, 306)
Some recommended books on organic synthesis:
- Clayden, Greeves, Warren; Organic Chemistry (basic organic chemistry knowledge)
- Wyatt, Warren; Organic Synthesis: The Disconnection Approach (excellent introduction to retrosynthesis)
- Kurti, Czako; Strategic Applications of Named Reactions in Organic Synthesis (extensive toolkit of functional group reactions and applications thereof with common conditions)
- Nicolaou; Classics in Total Synthesis 1-3 (the ultimate total synthesis trilogy)
- Nicolaou; Molecules That Changed the World (the world's most important molecules and their impact on everyday life)
- Carreira, Kvaerno; Classics in Stereoselective Synthesis (compilation of the groundbreaking methods of stereoselective synthesis and application to synthesis of stereochemically complex structures)

Пікірлер: 45

  • @totalsynthesis
    @totalsynthesis Жыл бұрын

    What do YOU think about the two syntheses? Let me know in the comments! Massive thank you to all channel supporters! instagram.com/totalsynthesis_official/; www.patreon.com/totalsynthesis

  • @VKS_314
    @VKS_314 Жыл бұрын

    must admit, as a high school student, i barely understood anything yet i found it quite amusing. I'm in awe. chemistry is wonderful.

  • @tamarisauce1278

    @tamarisauce1278

    7 ай бұрын

    same lmfao

  • @glebanful
    @glebanful Жыл бұрын

    4 mg, from 96 kg after 10 columns, and then you have to convince the NMR guys to make good 2D spectra... Thank you for putting huge effort into another brilliant video!

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

  • @sadface7457
    @sadface7457 Жыл бұрын

    I am in awe of chemists

  • @suneelgaur5246
    @suneelgaur524611 ай бұрын

    The ingenuity of synthetic chemists never ceases to amaze... Also doing this work.must be a great test of your resilience and character..just think of the many days and months in the lab when all reactions are failing... can be quite soul destroying.

  • @totalsynthesis

    @totalsynthesis

    11 ай бұрын

    Oh for sure, few things are worse than trying the same step/ reaction for months without success!

  • @chadkline4268

    @chadkline4268

    5 ай бұрын

    The plants man .. the real chemists. They didn't use any glassware or expensive chemicals 😂

  • @lunchbr4ke528
    @lunchbr4ke528 Жыл бұрын

    As someone whos doing their bachelors thesis in bioorganic chemistry rn, i’m just in awe… long way to go but wow, if it isn’t worth the ride

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Good luck on your thesis 💪

  • @definetlynotacomment1184
    @definetlynotacomment1184 Жыл бұрын

    Damn! You outdid yourself again. That second synthesis was insane. Keep up the good work.

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Thanks!

  • @Dave-oz4rr
    @Dave-oz4rr Жыл бұрын

    Wow just found this channel, what a phenomenal content! I love it, subscribed instantly :)

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Awesome man, thanks!

  • @user-tw1ui7zu1m
    @user-tw1ui7zu1mАй бұрын

    In The Rych-guy's synthesis, the enol ether D-A reaction is actually very interesting! DBU first deprotonates the unsaturated ketone at the delta-position, then the silyl group captures the oxygens. Then a very facile [1,5]-H migration happens before the cycloaddition, so if you deuterates the ketone alpha-H, you will find it in the single bridge in the product. Came across this in a quiz, and missed it

  • @tutinof
    @tutinof Жыл бұрын

    Outstanding!

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Thank you!!

  • @samueldeschwanden3065
    @samueldeschwanden3065 Жыл бұрын

    Amazing video as always ❤

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    🔥🔥🔥

  • @Tbone913
    @Tbone913 Жыл бұрын

    Great content, thank you.

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Thanks!

  • @philidor9657
    @philidor965710 ай бұрын

    Great video. That purification process the first group did to obtain the natural product from fruit was insane. It was like comically long. I wouldn't want to be the person to have to do all of that hahah. Very impressive. Not to mention those total syntheses were definitely wild rides. Also very impressive.

  • @totalsynthesis

    @totalsynthesis

    10 ай бұрын

    Thanks mate! I've literally just published a new video that covers quite some chemistry if you are interested!

  • @everythingexplained3226
    @everythingexplained3226 Жыл бұрын

    Always a pleasure. Here's one for the algo

  • @jorritmorrit
    @jorritmorrit Жыл бұрын

    How would you synthesize Alstoscholactine and Alstolaxepine?

  • @atescoshorse8399
    @atescoshorse8399 Жыл бұрын

    fantastically insightful video as always, quick question do you work in the field of synthetic organic chemistry?

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Not anymore!

  • @flaplaya
    @flaplaya Жыл бұрын

    I'm in awe at the patience of this creator.. If you draw out reaction schemes in chem draw, I'm humbled. I'd predict this molecule class would be toxic with all those epoxides.

  • @brettmoore3194
    @brettmoore319417 күн бұрын

    I would prefer the natural isolation if i was going to ingest🎉

  • @luke144
    @luke144 Жыл бұрын

    I have a degenerative brain disease. It's in it's early stages but scary non the less. This is a huge leap in my opinion. Where do I donate?

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    These molecules are unfortunately years away from pre-clinical research, let alone clinical! All the best

  • @luke144

    @luke144

    Жыл бұрын

    @@totalsynthesis right but we are thinking in the right direction. If I drop dead right now I could die knowing we are on the right road. This will only be available to the rich for a while but that's why you befriend a good chemist!

  • @meiersdixon
    @meiersdixon Жыл бұрын

    Maybe I’m being dumb, but should there not be another carbon in the transition state at 5:08? After the diels-alder, the ring on the left seems to be 5 membered, but based on the transition state, it ought to be 4 membered. Also great video, super interesting!

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Yea very well spotted, they lost one carbon in that drawing :)

  • @agustinmassera8506
    @agustinmassera8506 Жыл бұрын

    Interesting video could you please send me a link to the Illusionism A rat study I would like to check out that paper

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    Illisimonin A: www.sciencedirect.com/org/science/article/abs/pii/S1523706021016321 Jiadifenolide: pubs.acs.org/doi/10.1021/ol9021029

  • @user255
    @user255 Жыл бұрын

    I hope enzyme chemistry could be used more... so many harsh solvents and reagents.

  • @user-yz2hn4nw6o

    @user-yz2hn4nw6o

    Жыл бұрын

    We may think about how the enzyme in organism that create so much complex molecules with only one stereoisomer they want. That is a good reason that we protect the environment, not to challenge ourselves to acheive the works of the enzymes. All organisms are the master of organic chemist, right?

  • @skyethebi
    @skyethebi11 ай бұрын

    5:37 is it just me or is there an extra carbon coming in out of nowhere for that ring. I’m not too good with organic synthesis but I’m counting more carbons in the diels alder product than there is before the reaction. Am I completely missing something?

  • @totalsynthesis

    @totalsynthesis

    10 ай бұрын

    Yes, the authors drew the intermediate just prior to the rxn with a carbon less! (just a slip up)

  • @Grak70
    @Grak70 Жыл бұрын

    I love organic chemistry and I can't follow literally anything in this retrosynthesis.

  • @totalsynthesis

    @totalsynthesis

    Жыл бұрын

    😂 I hope the first step was ok? For the other stepy, I intentionally did not show every detail or talk too much theory so the video doesnt get too long

  • @Grak70

    @Grak70

    Жыл бұрын

    @@totalsynthesis not your fault at all! And yes, I did see the ester disconnection. But when it went into the ring contraction pinacol rearrangement my head started hurting.

  • @fredcrayon
    @fredcrayon4 ай бұрын

    And I thought strychnine synthesis was hard 😂😂😂

Келесі