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Loss of Carboxy Group as CO2: Decarboxylation of β-Ketoacids01:02

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Updated: Jul 9, 2026

Light-driven Enzymatic Decarboxylation
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Published on: May 22, 2016

The decarboxylative Blaise reaction.

Jae Hoon Lee1, Bo Seung Choi, Jay Hyok Chang

  • 1Chemical Development Division, LG Life Sciences, Ltd./R&D, 104-1 Moonji-dong, Yusong-gu, Daejeon 305-380, Korea.

The Journal of Organic Chemistry
|December 1, 2007
PubMed
Summary

A new method efficiently synthesizes beta-amino acrylates from aryl nitriles and potassium ethyl malonate. This safer, endothermic reaction avoids hazardous reagents and uses less zinc chloride than traditional methods.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • The Blaise reaction is a classical method for synthesizing beta-amino esters.
  • Traditional Blaise reactions often involve hazardous and lacrimatory reagents.
  • Optimization of Blaise reaction conditions is crucial for safety and efficiency.

Purpose of the Study:

  • To develop a safer and more efficient synthesis of beta-amino acrylates.
  • To explore an alternative to the classical Blaise reaction using readily available reagents.
  • To investigate the use of zinc chloride and Hünig's base in this transformation.

Main Methods:

  • Reaction of aryl nitriles with potassium ethyl malonate.
  • Catalysis using a small amount of Hünig's base.
  • Inclusion of zinc chloride as a Lewis acid catalyst.

Main Results:

  • Beta-amino acrylates were synthesized in moderate to good yields.
  • The reaction is endothermic, indicating improved safety.
  • The method requires only 0.5-1.0 equivalents of zinc chloride.
  • The reaction avoids the use of lacrimatory reagents.

Conclusions:

  • This modified reaction offers a safer and more practical alternative to the classical Blaise reaction.
  • The protocol is efficient for the synthesis of valuable beta-amino acrylate intermediates.
  • The use of zinc chloride and Hünig's base provides a mild and effective catalytic system.