Synthesis 2017; 49(10): 2266-2274
DOI: 10.1055/s-0036-1588130
paper
© Georg Thieme Verlag Stuttgart · New York

Development of an Industrial Process Based on the Groebke–Blackburn–Bienaymé Multicomponent Reaction: Efficient Preparation­ of 3-Aminoimidazo[1,2-a]pyrazines

Markus Baenziger
,
Estelle Durantie*
,
Christian Mathes
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Publikationsverlauf

Received: 18. November 2016

Accepted after revision: 06. Dezember 2016

Publikationsdatum:
31. Januar 2017 (online)


Abstract

3-Aminoimidazo[1,2-a]pyrazine is an important scaffold that is found in many drugs. This scaffold is rapidly accessible through a Groebke–Blackburn–Bienaymé cyclisation starting from an aminopyrazine, an aldehyde and an isocyanide. A scale-up process of this multicomponent reaction has been achieved in high yield and with excellent purity. The scope and limitations of this process leading to various 3-aminoimidazo[1,2-a]pyrazines are disclosed.

Supporting Information