Novel Thiophene Compound and Process for Producing Caffenofuran or Analogue Thereof from the Same
申请人:Katsumura Shigeo
公开号:US20080167481A1
公开(公告)日:2008-07-10
The present invention provides a novel thiophene compound as a synthetic intermediate that is useful for efficient production of kahweofuran or an analogue thereof. The present invention also provides a process for producing kahweofuran or an analogue thereof using the novel thiophene compound as an intermediate material.
Of novel thiophene compounds represented by Formula (1):
wherein R
1
is a hydrogen atom or a C
1
-C
4
lower alkyl group; R
2
is a hydrogen atom or an alcohol-protecting group; R
3
is a hydrogen atom, —COR
4
or —C(OH)R
5
(wherein R
4
and R
5
each represent a C
1
-C
4
lower alkyl group); provided that when R
2
and R
3
are hydrogen atoms, R
1
is not any of a hydrogen atom, methyl group, or n-propyl group; a thiophene compound represented by Formula (2) is reduced and cyclized in the presence of a transition metal catalyst to produce kahweofuran or kahweofuran analogue (3
a
) shown below:
wherein R
1
is a hydrogen atom or a C
1
-C
4
lower alkyl group, and R
4
is a C
1
-C
4
lower alkyl group.