Reaction screening · Mass spectrometry
Six thousand reactions an hour changes which chemistry questions can be asked
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Short answer
Nanolitre reaction spots read by DESI-MS screened thousands of reactions per hour on sub-microgram quantities, with reduced qualitative reproducibility at top speed.
What happened
Wleklinski and colleagues spotted nanolitre reaction mixtures on porous PTFE and analysed them by desorption electrospray ionisation tandem mass spectrometry, screening N-alkylations and palladium-catalysed Suzuki couplings across plates of several thousand spots. Product ions appeared within about a second per droplet. Benzyl bromide alkylated seven of eight amines against three of eight for 2-(bromoethyl)benzene. At 6,144-well density the method reached 6,004 reactions per hour using under 0.5 µg of each reagent in 50 nL spots.
Why it matters
Reaction screening has been rate-limited by how much material a condition consumes. At microgram scale a chemist tests the conditions they already suspect; at these throughputs the space itself can be mapped. The paper is also clear that a hit here is a starting point, not an optimised yield.
Evidence
- Study type
- Method development with N-alkylation and Suzuki coupling screens on multi-thousand-spot plates
- Sample
- Plates up to 6,144 wells; 50 nL spots using under 0.5 µg of each reagent
- Journal
- Chemical Science · peer reviewed
- Replication
- Not assessed in this corpus
- Limitations
- Qualitative reproducibility falls at the highest analysis speeds. The paper does not show that DESI-MS hits transfer to optimised continuous-flow or preparative yields.
What this connects to
Sources
The one study this explanation is built from, by the role each plays. Every source links to PaperFren’s explanation of it and to the original paper.
Primary study
- Screening reactions in one-second DESI-MS droplets
Desorption electrospray ionization mass spectrometry reads amine alkylation and Suzuki hits from nanoliter spots in about a second.
What it does not showLimitations
Qualitative reproducibility falls at the highest speeds, and translating every DESI hit to optimized continuous-flow yield is not completed in this paper.
PaperFren explanationStudy with cards and a quizOriginal paper (DOI)cc by
Before
Reaction condition screening ran at milligram-to-microgram scale in wells or vials, which bounded how much of a condition space could realistically be explored.
Now
Throughput rises by orders of magnitude and reagent consumption falls to sub-microgram. Qualitative reproducibility degrades at the fastest settings, and translating a DESI hit into an optimised preparative yield is not demonstrated here.