Process for the preparation of 7-substituted-hept-6-enoic and -heptanoic acids and derivatives thereof
申请人:SANDOZ AG
公开号:EP0363934A1
公开(公告)日:1990-04-18
A novel process for the preparation compounds of formula I
wherein
X is -CH₂CH₂- or -CH=CH-;
R₁ is an ester group inert to the reaction conditions; and
R is an organic radical having groups which are inert under reducing conditions,
by stereoselective reduction of a corresponding compound of formula II
wherein
R, R₁ and X are as defined above and
one of Z₁ and Z₂ is oxygen and the other is hydroxy and hydrogen,
is disclosed.
The compounds of formula I are pharmaceuticals, especially antiatherosclerotic, antihyperlipidemic and antihypercholesterolemic agents.
The process may also be applied to the preparation of compounds of formula Iu
u - OCH₂ -CH₂CH₂ - COORu Iu
wherein
u is triphenylmethyl (trityl) and
Ru is allyl or a radical forming an ester inert under the reaction conditions,
which are intermediates in the preparation of some of the compounds of formula I.
Novel processes for the preparation of earlier intermediates for use in the preparation of i.a. the compounds of formula I are also disclosed, namely
process A, comprising the preparation of the compounds of formula VII
(E) - OHC - CH=CH - N(R₁₂)R₁₃ (VII)
wherein
R₁₂ is C₁₋₃alkyl, phenyl or phenyl substituted by 1 to 3 substituents each of which is independently C₁₋₃alkyl, C₁₋₃alkoxy, fluoro, chloro, bromo or nitro with a maximum of two nitro groups; and
R₁₃ independently has the significance indicated above for R₁₂,
starting from corresponding compounds of formula VIII
OHC - N(R₁₂)R₁₃ (VIII)
and
process B, comprising the preparation of the compounds of formula Va
wherein
R₅ is hydrogen, C₁₋₃alkyl, n-butyl, i-butyl, t-butyl, C₃₋₆cycloalkyl, C₁₋₃alkoxy, n-butoxy, i-butoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy;
R₆ is hydrogen, C₁₋₃alkyl, C₁₋₃alkoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy;
with the provisos that not more than one of R₅ and R₆ is trifluoromethyl, not more than one of R₅ and R₆ is phenoxy, and not more than one of R₅ and R₆ is benzyloxy;
one of R₇ and R₈ is phenyl trisubstituted by R₉, R₁₀ and R₁₁ and the other is primary or secondary C₁₋₆alkyl not containing an asymmetric carbon atom, C₃₋₆cycloalkyl or phenyl-(CH₂)m-, wherein
R₉ is hydrogen, C₁₋₃alkyl, n-butyl, i-butyl, t-butyl, C₁₋₃alkoxy, n-butoxy, i-butoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy;
R₁₀ is hydrogen, C₁₋₃alkyl, C₁₋₃alkoxy, trifluoromethyl, fluoro, chloro, phenoxy or benzyloxy;
R₁₁ is hydrogen, C₁₋₂alkyl, C₁₋₂alkoxy, fluoro or chloro, and
m is 1, 2 or 3;
with the provisos that not more than one of R₉ and R₁₀ is trifluoromethyl, not more than one of R₉ and R₁₀ is phenoxy, and not more than one of R₉ and R₁₀ is benzyloxy,
starting from a subgroup of compounds of formula VII.
A specific embodiment of the above inventive concept is illustrated with the preparation of the compound of formula Ia
in racemic or optically pure form; in free acid, salt, ester or δ-lactone, i.e. internal ester, form.
一种制备式 I 化合物的新工艺
其中
X 是-CH₂CH₂- 或-CH=CH-;
R₁ 是对反应条件惰性的酯基;以及
R₁ 是在还原条件下惰性的有机基团、
通过立体选择性还原相应的式 II 化合物
其中
R、R₁ 和 X 如上文所定义,以及
Z₁ 和 Z₂ 中的一个是氧,另一个是羟基和氢、
公开了式 I 化合物。
式 I 的化合物是药物,特别是抗动脉粥样硬化、抗高血脂和抗高胆固醇药物。
该工艺也可用于制备式 Iu 的化合物
u - OCH₂ -CH₂CH₂ - COORu Iu
其中
u 是三苯甲基(三苯甲基)和
Ru 是烯丙基或在反应条件下形成惰性酯的自由基、
它们是制备某些式 I 化合物的中间体。
本发明还公开了制备用于制备即式 I 化合物的早期中间体的新工艺,即
工艺 A,包括制备式 VII 化合物
(e) - ohc - ch=ch - n(r₁₂)r₁₃ (vii)
其中
R₁₂ 是 C₁₋₃ 烷基、苯基或被 1 至 3 个取代基取代的苯基,每个取代基独立地为 C₁₋₃烷基、C₁₋₃烷氧基、氟基、氯基、溴基或硝基(最多两个硝基);以及
R₁₃ 独立地具有上述 R₁₂ 的意义、
从相应的式 VIII 化合物开始
OHC - N(R₁₂)R₁₃ (VIII)
以及
工艺 B,包括制备式 Va 的化合物
其中
R₅ 是氢、C₁₋₃烷基、正丁基、异丁基、叔丁基、C₃₋₆环烷基、C₁₋₃烷氧基、正丁氧基、异丁氧基、三氟甲基、氟、氯、苯氧基或苄氧基;
R₆ 是氢、C₁₋₃烷基、C₁₋₃烷氧基、三氟甲基、氟、氯、苯氧基或苄氧基;
但 R₅ 和 R₆ 中不超过一个是三氟甲基,R₅ 和 R₆ 中不超过一个是苯氧基,R₅ 和 R₆ 中不超过一个是苄氧基;
R₇ 和 R₈ 中的一个是被 R₉、R₁₀ 和 R₁₁ 三取代的苯基,另一个是不含不对称碳原子的伯或仲 C₁₋₆ 烷基、C₃₋₆cycloalkyl 或苯基-(CH₂)m-,其中
R𠢙 是氢、C₁₋₃烷基、正丁基、异丁基、叔丁基、C₁₋₃烷氧基、正丁氧基、异丁氧基、三氟甲基、氟、氯、苯氧基或苄氧基;
R₁₀ 是氢、C₁₋₃烷基、C₁₋₃烷氧基、三氟甲基、氟、氯、苯氧基或苄氧基;
R₁₁ 是氢、C₁₋₂烷基、C₁₋₂烷氧基、氟或氯,以及
m 为 1、2 或 3;
但 R𠢙 和 R₁₀ 中不超过一个是三氟甲基,R₉ 和 R₁₀ 中不超过一个是苯氧基,R₉ 和 R₁₀ 中不超过一个是苄氧基、
从式 VII 的化合物亚群开始。
上述发明构思的一个具体实施例是制备式 Ia 的化合物
外消旋或光学纯形式;游离酸、盐、酯或 δ-内酯,即内酯形式。