C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/359.2
C07D 311/22 (2006.01) C07D 311/74 (2006.01) C07D 311/96 (2006.01)
Patent
CA 1262139
ABSTRACT OF THE DISCLOSURE Disclosed herein is a process for producing a 2,3-dihydro-[4H]-1-benzo- pyran-4-one of the formula Image wherein each of R1 and R2, being the same or different, is hydrogen or C1-C10 alkyl; or R1 and R2, taken together, form a C5-C7 cycloalkyl ring; R3 is hydrogen, C1-C10 alkyl or phenyl; R4 is hydrogen or C1-C6 alkyl; R5 is -OR9 or -SR9, wherein R9 is hydrogen or C1-C6 alkyl; each of R6, R7 and R8, being the same or different is hydrogen, C1-Cl2 alkyl or phenyl; and the salts thereof with bases; which is useful as medicine for central nervous system as well as intermediate for producing other medicines, the process comprising: reacting a compound of the formula Image with a compound of the formula or a reactive derivative thereof to obtain an intermediate Image of the formula Image and where required introducing alkyl R4, and aromatizating the intermediate to obtain the desired compound. Some of the intermediates are new.
460322
Arnoldi Anna
Merlini Lucio
Farmitalia Carlo Erba S.r.l.
Fetherstonhaugh & Co.
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