METHOD FOR THE PRODUCTION OF MUMBAISTATIN DERIVATIVES
申请人:SCHWINK Lothar
公开号:US20090156836A1
公开(公告)日:2009-06-18
The present invention relates to a process for preparing mumbaistatin derivatives (I), where the anthraquinone skeleton is constructed via a Diels-Alder reaction and the central methylene bridge via a transition metal-catalyzed reaction, and to the intermediates used in this process.
An economical process for producing (2- and/or 1-)cyclohexenyl methyl ketones which are intermediates for the synthesis of &agr;- or &bgr;-damascone. In the presence of a catalyst, a 3-cyclohexenyl methyl ketone represented by the following formula (1a):
1
wherein, R
1
, R
2
and R
3
each independently represents a hydrogen atom or a methyl group and at least two of R
1
, R
2
and R
3
are methyl groups, is isomerized.
An economical process for producing (2- and/or 1-)cyclohexenyl methyl ketones which are intermediates for the synthesis of α- or β-damascone. In the presence of a catalyst, a 3-cyclohexenyl methyl ketone represented by the following formula (1a):
wherein, R1, R2 and R3 each independently represents a hydrogen atom or a methyl group and at least two of R1, R2 and R3 are methyl groups, is isomerized.