Synthesis 2016; 48(01): 31-42
DOI: 10.1055/s-0035-1560363
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© Georg Thieme Verlag Stuttgart · New York

Green Oxidation of Amines to Imines Based on the Development of Novel Catalytic Systems Using Molecular Oxygen or Hydrogen Peroxide

Kuniaki Marui
a   Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan   Email: ogawa@chem.osakafu-u.ac.jp
,
Akihiro Nomoto
a   Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan   Email: ogawa@chem.osakafu-u.ac.jp
,
Haruo Akashi
b   Research Institute of Natural Sciences, Okayama University of Science, Ridai-cho, Okayama 700-0005, Japan   Email: akashi@rins.ous.ac.jp
,
Akiya Ogawa*
a   Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan   Email: ogawa@chem.osakafu-u.ac.jp
› Author Affiliations
Further Information

Publication History

Received: 10 October 2015

Accepted: 14 October 2015

Publication Date:
04 November 2015 (online)


Abstract

Amines are transformed into the corresponding imines by environmentally benign catalytic oxidation reactions. Gaseous oxygen or hydrogen peroxide is used as the oxidant, and water is the only byproduct. When a vanadium complex is used as the catalyst in an ionic liquid, the amine oxidation successfully proceeds with recycling of the catalyst. Amine oxidation with hydrogen peroxide as an oxidant in water is also attained by using copper(II) sulfate as catalyst. In addition, photoinduced oxidation of amines to imines is conducted by using oxygen as the oxidant in the presence of a zinc–chlorin complex as catalyst.