Process for preparing formoterol and related compounds
First Claim
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1. A process for preparing a compound of the formula I ##STR17## wherein R1 is H or a straight or branched alkyl group having 1-5 carbon atoms, A is either ##STR18## wherein R is a straight or branched alkyl group having 1-5 carbon atoms and R2 is H or a straight or branched alkyl group having 1-5 carbon atoms;
- or ##STR19## wherein R is as defined above, in the form of a pure racemate, which comprises the steps ofa) reacting ##STR20## to give compound IV ##STR21## b) reducing and formylating compound IV to give compound V ##STR22## c) forming the fumarate of compound V and separating the racemates by crystallization,d) extracting the base of the desired racemate of compound V,e) hydrogenolyzing of the protecting benzyl groups of said base of compound V andf) alkylating the compound obtained.
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Abstract
The present invention is directed to a process for preparing formoterol and related compounds and derivatives thereof and their pharmacologically and pharmaceutically acceptable fumarate salts and/or solvates. The present invention is also directed to certain formoterol related compounds per se.
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11 Claims
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1. A process for preparing a compound of the formula I ##STR17## wherein R1 is H or a straight or branched alkyl group having 1-5 carbon atoms, A is either ##STR18## wherein R is a straight or branched alkyl group having 1-5 carbon atoms and R2 is H or a straight or branched alkyl group having 1-5 carbon atoms;
- or ##STR19## wherein R is as defined above, in the form of a pure racemate, which comprises the steps of
a) reacting ##STR20## to give compound IV ##STR21## b) reducing and formylating compound IV to give compound V ##STR22## c) forming the fumarate of compound V and separating the racemates by crystallization, d) extracting the base of the desired racemate of compound V, e) hydrogenolyzing of the protecting benzyl groups of said base of compound V and f) alkylating the compound obtained. - View Dependent Claims (4, 6, 7, 8, 9, 10, 11)
- or ##STR19## wherein R is as defined above, in the form of a pure racemate, which comprises the steps of
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2. A compound of the formula I ##STR23## or a pharmaceutically acceptable fumarate and/or solvate thereof, in the form of the pure racemates or a mixture of the four isomers, wherein R1 is H or a straight or branched alkyl group having 1-5 carbon atoms, A is either ##STR24## wherein R is a straight or branched alkyl group having 1-5 carbon atoms and R2 is H or a straight or branched alkyl group having 1-5 carbon atoms;
- or ##STR25## wherein R is as defined above.
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3. A process for preparing a compound of the formula I ##STR26## wherein A is ##STR27## and R1 is H, in the form of a pure racemate, which comprises the steps of
a) reacting ##STR28## to give compound IV ##STR29## b) reducing and formylating compound IV to give compound V ##STR30## c) forming the fumarate of compound V and separating the racemates by crystallization, d) extracting the base of the desired racemate of compound V, and e) hydrogenolyzing the protecting benzyl groups of said base of compound V.
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