Pomeranz–Fritsch reaction

Pomeranz–Fritsch reaction
Named after Cäsar Pomeranz
Paul Fritsch
Reaction type Ring forming reaction

The Pomeranz–Fritsch reaction, also named Pomeranz–Fritsch cyclization, is a name reaction in the organic chemistry. It is named after Paul Fritsch (1859–1913) and Cäsar Pomeranz (1860–1926).[1][2] In general it is a synthesis of isoquinoline.[2][3][4]

General Reaction Scheme

The reaction below shows the acid-promoted synthesis of isoquinoline from benzaldehyde and a 2,2-dialkoxyethylamine.[5]

Various alkyl groups, e.g. methyl and ethyl groups, can be used as substituent R.

In the archetypical reaction sulfuric acid was used as proton donor, but Lewis acids such as trifluoroacetic anhydride and lanthanide triflates have been used occasionally.[1][2][4] Later, a wide range of diverse isoquinolines were successfully prepared.[4]

Reaction Mechanism

A possible mechanism is depicted below:[5]

First the benzalaminoacetal 1 is built by the condensation of benzaldehyde and a 2,2-dialkoxyethylamine. After the condensation a hydrogen-atom is added to one of the alkoxy groups. Subsequently an alcohol is removed. Next, the compound 2 is built. After that a second hydrogend-atom is added to the compound. In the last step a second alcohol is removed and the bicyclic system becomes aromatic.

Applications

The Pomeranz–Fritsch reaction has general application in the preparation of isoquinoline derivatives.
Isoquinolines find many applications, including:[3][4]

See also

References

  1. 1 2 Pomeranz, C. (December 1893). "Uber eine neue Isochinolinsynthese". Monatshefte fur Chemie 14 (1): 116–119. doi:10.1007/BF01517862.
  2. 1 2 3 Fritsch, Paul (January 1893). "Synthesen in der Isocumarin- und Isochinolinreihe". Berichte der deutschen chemischen Gesellschaft 26 (1): 419–422. doi:10.1002/cber.18930260191.
  3. 1 2 Wang, Zerong (2009). Comprehensive organic name reactions and reagents. Hoboken, N.J.: John Wiley. pp. 2256–2259. ISBN 978-0-471-70450-8.
  4. 1 2 3 4 Kürti, László; Czakó, Barbara (2007). Strategic applications of named reactions in organic synthesis : background and detailed mechanisms ; 250 named reactions (Pbk. ed., [Nachdr.]. ed.). Amsterdam [u.a.]: Elsevier Academic Press. pp. 358–359. ISBN 978-0-12-429785-2.
  5. 1 2 Li, Jie Jack (2006). Name reactions : a collection of detailed reaction mechanisms ; [more than 300 reactions] (3., expanded ed.). Berlin [u.a.]: Springer. pp. 472–474. ISBN 978-3-540-30030-4.
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