One-pot synthesis

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In chemistry a one-pot synthesis is a strategy to improve the efficiency of a chemical reaction whereby a reactant is subjected to successive chemical reactions in just one reactor. This is much desired by chemists because avoiding a lengthy separation process and purification of the intermediate chemical compounds would save time and resources while increasing chemical yield.

An example of a one-pot synthesis is the total synthesis of tropinone,[1] or the Gassman indole synthesis.[citation needed] Sequential one-pot syntheses can be used to generate even complex targets with multiple stereocentres, such as oseltamivir,[2] which may significantly shorten the number of steps required overall and have important commercial implications.

A sequential one-pot synthesis with reagents added to a reactor one at a time and without work-up is also called a telescoping synthesis.

In one such procedure [3] the reaction of 3-N-tosylaminophenol I with acrolein II affords a hydroxyl substituted quinoline III through 4 sequential steps without workup of the intermediate products:[4]

One-Pot Preparation of 7-Hydroxyquinoline

Further examples[edit]

References[edit]

  1. ^ Mikami, K.; Ohmura, H. (2002). "One-pot synthesis of tropinone by tandem (domino) ene-type reactions of acetone silyl enol ethers". Chemical Communications (22): 2626. doi:10.1039/b208066d.  edit
  2. ^ Ishikawa, H.; Suzuki, T.; Hayashi, Y. (2009). "High-yielding synthesis of the anti-influenza neuramidase inhibitor (-)-oseltamivir by three "one-pot" operations". Angewandte Chemie (International ed. in English) 48 (7): 1304–1307. doi:10.1002/anie.200804883. PMID 19123206.  edit
  3. ^ Cameron, M.; Hoerrner, R. S.; McNamara, J. M.; Figus, M.; Thomas, S. (2006). "One-Pot Preparation of 7-Hydroxyquinoline". Organic Process Research & Development 10 (1): 149. doi:10.1021/op0501545.  edit
  4. ^ The addition of acrolein (blue) is a Michael reaction catalyzed by N,N-diisopropylamine, the presence of ethanol converts the aldehyde group to an acetal but this process is reversed when hydrochloric acid is introduced (red). The enolate reacts as an electrophile in a Friedel-Crafts reaction with ring-closure. The alcohol group is eliminated in presence of potassium hydroxide (green) and when in the final step the reaction medium is neutralized to pH 7 (magenta) the tosyl group is eliminated as well.
  5. ^ Goswami, A.; Kotoky, R.; Rastogi, R. C.; Ghosh, A. C. (2003). "A One-Pot Efficient Process for 16-Dehydropregnenolone Acetate". Organic Process Research & Development 7 (3): 306. doi:10.1021/op0200625.  edit
  6. ^ Ganesan, K.; Pande, A. (2005). "A convenient one pot synthesis of fentanyl". Journal of Chemical Research 2005 (7): 452. doi:10.3184/030823405774309078.  edit
  7. ^ WO 2010083722