Original loading and Suzuki conditions for the solid-phase synthesis of biphenyltetrazoles. Application to the first solid-phase synthesis of irbesartan
the heterocycle on a hydroxylated resin using zinc triflate. New Suzuki–Miyaura cross-coupling conditions are developed for the quantitative formation of the phenyl–phenyl bond. Our straightforward synthesis scheme, starting from the conserved phenyltetrazole moiety and ending with the appending of the structurally variable moiety, is well suited to the preparation of sartans and their analogues at
PROCESS FOR PRODUCING TETRAZOLE COMPOUND AND INTERMEDIATE THEREFOR
申请人:SUMITOMO CHEMICAL COMPANY LIMITED
公开号:EP0711762A1
公开(公告)日:1996-05-15
There are disclosed an industrially favorable process for producing a tetrazole compound of general formula (1):
characterized in that a nitrile of general formula (2):
R¹CN (2)
is reacted with hydrazine or a salt thereof in the presence of a catalyst, followed by reaction with a nitrous acid compound of general formula (3):
ANO₂ (3)
or a nitrile of general formula (2) is reacted with hydrogen sulfide, followed by reaction with an alkyl halide of general formula (4):
R⁴J (4)
with hydrazine or a salt thereof, and then with a nitrous acid compound of general formula (3); and an intermediate of general formula (5):
R¹C(=R⁵)R⁶ (5)
which is useful for the production of the tetrazole compound (in which R¹ to R⁶, A and J in the above formulas are as defined in the specification).
The present invention relates to tetrazole containing compounds of general formula (I) as described and defined herein, to pharmaceutical compositions and combinations comprising said compounds and to the use of said compounds for manufacturing a pharmaceutical composition for the treatment or prophylaxis of a disease syndrome, condition, or symptoms, in particular related to chronic pain and inflammation, as a sole agent or in combination with other active ingredients.