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Synthesis of (2 S, 3 R, 4 R)-Dihydroxyisoleucine for Use in Amatoxin Synthesis
Chandra, Shambhu Deo ; Gunasekera, Shanal ; Noichl, Benjamin Philipp , et al. JOC,2024,89(17):12739-12747. DOI: 10.1021/acs.joc.4c01051
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Abstract: We report a streamlined synthesis of (2S,3R,4R)-4,5-dihydroxy isoleucine (DHIle), an amino acid found in α-amanitin, which appears to be critical for toxicity. This synthetic route is transition metal-free and enables the production of significant quantities of DHIle with suitable protection for use in peptide synthesis. Its incorporation into a cytotoxic amatoxin analog is reported.
Purchased from AmBeed: 147-85-3 ; 74124-79-1 ; 3001-72-7 ; 288-32-4
CAS No. : | 3001-72-7 | MDL No. : | MFCD00005554 |
Formula : | C7H12N2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | SGUVLZREKBPKCE-UHFFFAOYSA-N |
M.W : | 124.18 | Pubchem ID : | 76349 |
Synonyms : |
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Signal Word: | Danger | Class: | 8 |
Precautionary Statements: | P280-P305+P351+P338-P310 | UN#: | 3267 |
Hazard Statements: | H314 | Packing Group: | Ⅱ |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In 1,4-dioxane; | EXAMPLE 3 7,8-Dimethoxy-1H-1,2,4-thiadiazolo[3,4-b]quinazolin-5-one-2,2-dioxide. To a stirred slurry of <strong>[20197-92-6]4,5-dimethoxyisatoic anhydride</strong> (4.46 g, 20 mmol) and S-methyl-N-(chloromethanesulfonyl)isothiourea (4.06 g, 20 mmol) in dioxane (30 ml) is added 1,5-diazabicyclo[4.3.0]non-5-ene (2.5 ml). The mixture is refluxed for 4 hr under nitrogen, then cooled and poured into 0.3N aqueous hydrochloric acid. The precipitate is collected by filtration and recrystallized from DMSO to provide the title compound as a light yellow solid, mp >300° C. (445 mg, 7.5percent). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ethyl acetate; at 20℃; for 24h; | 1,5-diazabicyclo [4.3.0] non-5-ene (lOmmol) was dissolved in 20 mL of ethyl acetate,2-Bromoethoxyethanol (1 Ommo 1) was slowly added dropwise at room temperature, and the reaction was stirred at room temperature for 24 hours to produce a transparent liquid.The solvent was removed by rotary evaporator, washed several times with anhydrous ether, dried under vacuum at 120 C for 24 hours, and the product was liquid at room temperature. |
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