Process for preparing taxoids
First Claim
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1. A process for preparing a taxoid of formula I:
- ##STR27## in which R represents a hydrogen atom or an acetyl, alkoxyacetyl, or alkyl radical, R1 represents a benzoyl radical or a radical R2 --O--CO in which R2 represents an alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl radical, and Ar represents an aryl radical, comprising the steps ofesterifying a compound of the formula VI;
##STR28## in which G1 represents a hydrogen atom or an acetyl, alkoxyacetyl or alkyl radical or a hydroxy-protecting group, with a free acid of the formula VII;
##STR29## in which Ar and R1 are as defined above, and R3 and R4, which are identical or different, represent an alkyl radical containing 1 to 4 carbon atoms or an aralkyl radical whose alkyl portion contains 1 to 4 carbon atoms or an aryl radical, or R3 represents a trihalomethyl radical or a phenyl radical substituted by a trihalomethyl radical and R4 represents a hydrogen atom, or R3 and R4 form, together with the carbon atom to which they are attached, a 4- or 7-membered ring, to give, after treating in acidic medium, a compound of the formula IV;
##STR30## in which Ar and G1 are as defined above, acylating the compound with benzoyl chloride or a reactive derivative of the formula;
space="preserve" listing-type="equation">R.sub.2 --O--CO--Xin which X represents a halogen atom or a residue --O--R2 or --O--CO--O--R2, and R2 is as defined above, to give a produce of formula I or a compound of formula III ##STR31## wherein G1 represents a protecting group that is removed to give a product of formula I.
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Abstract
The invention relates to a process for preparing taxoids of formula I herein that includes the steps of esterifying a baccatin III derivative of the formula VI herein, acylating the compound obtained, and optionally removing a protecting group to give the desired taxoid product.
35 Citations
32 Claims
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1. A process for preparing a taxoid of formula I:
- ##STR27## in which R represents a hydrogen atom or an acetyl, alkoxyacetyl, or alkyl radical, R1 represents a benzoyl radical or a radical R2 --O--CO in which R2 represents an alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl radical, and Ar represents an aryl radical, comprising the steps of
esterifying a compound of the formula VI;
##STR28## in which G1 represents a hydrogen atom or an acetyl, alkoxyacetyl or alkyl radical or a hydroxy-protecting group, with a free acid of the formula VII;
##STR29## in which Ar and R1 are as defined above, and R3 and R4, which are identical or different, represent an alkyl radical containing 1 to 4 carbon atoms or an aralkyl radical whose alkyl portion contains 1 to 4 carbon atoms or an aryl radical, or R3 represents a trihalomethyl radical or a phenyl radical substituted by a trihalomethyl radical and R4 represents a hydrogen atom, or R3 and R4 form, together with the carbon atom to which they are attached, a 4- or 7-membered ring, to give, after treating in acidic medium, a compound of the formula IV;
##STR30## in which Ar and G1 are as defined above, acylating the compound with benzoyl chloride or a reactive derivative of the formula;
space="preserve" listing-type="equation">R.sub.2 --O--CO--Xin which X represents a halogen atom or a residue --O--R2 or --O--CO--O--R2, and R2 is as defined above, to give a produce of formula I or a compound of formula III ##STR31## wherein G1 represents a protecting group that is removed to give a product of formula I. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- ##STR27## in which R represents a hydrogen atom or an acetyl, alkoxyacetyl, or alkyl radical, R1 represents a benzoyl radical or a radical R2 --O--CO in which R2 represents an alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl radical, and Ar represents an aryl radical, comprising the steps of
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17. A process for preparing a taxoid of formula I:
- ##STR32## in which R represent a hydrogen atom or an acetyl, alkoxyacetyl, or alkyl radical, R1 represents a radical R2 --O--CO-- in which R2 represents an alkyl radical, and Ar represents an aryl radical, comprising the steps of
esterifying a compound of the formula VI;
##STR33## in which G1 represents a hydrogen atom or an acetyl, alkoxyacetyl or alkyl radical or a hydroxy-protecting group, with a free acid of the formula VII;
##STR34## in which Ar and R1 are as defined above, and R3 and R4, which are identical or different, represent an alkyl radical containing 1 to 4 carbon atoms or a aralkyl radical whose alkyl portion contains 1 to 4 carbon atoms or an aryl radical, or R3 represents a trihalomethyl radical or a phenyl radical substituted by a trihalomethyl radical and R4 represents a hydrogen atom, or R3 and R4 form, together with the carbon atom to which they are attached, a 4- or 7-membered ring, to give, after treating in acidic medium, a compound of the formula IV;
##STR35## in which Ar and G1 are as defined above, acylating the compound of formula IV with a benzoyl chloride or a reactive derivative of the formula;
space="preserve" listing-type="equation">R.sub.2 --O--CO--Xin which X represents a halogen atom or a residue --O--R2 or --O--CO--O--R2, and R2 is as defined above, to give a produce of formula I or a compound of formula III ##STR36## wherein G1 represents a protecting group that is removed to give a produce of formula I. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
- ##STR32## in which R represent a hydrogen atom or an acetyl, alkoxyacetyl, or alkyl radical, R1 represents a radical R2 --O--CO-- in which R2 represents an alkyl radical, and Ar represents an aryl radical, comprising the steps of
Specification