There are disclosed compounds of Formulas I and II: ##STR1## wherein R.sup.1 and R.sup.2 may be hydrogen, lower alkyl having from 1 to 8 carbon atoms, lower alkenyl having from 3 to 6 carbon atoms, lower alkoxy having from 1 to 6 carbon atoms, hydroxy, nitro, amino, halo including chlorine, bromine, iodine, and fluorine, phenyl, alkanoyl having from 2 to 6 carbon atoms or they are bonded to one another to form a cycloalkene ring fused to the thiophene ring and having a total of from 5 to 7 annular ring carbon atoms, and R.sup.3 is an aliphatic or an aromatic group such as lower alkyl, e.g., methyl or ethyl. Such compounds are useful as intermediates in the production of tiprinast and related compounds. There is also disclosed a process for the regioselective synthesis of a compound of Formula I wherein R.sup.1 is CH.sub.3 and R.sup.2 is (CH.sub.3).sub.2 CHCH.sub.2 which comprises reacting a mixture of compounds of the following formulas: ##STR2## and ##STR3## with trichloroacetonitrile under acidic conditions.
公开了I和II式的化合物:##STR1## 其中R1和R2可以是氢,具有1至8个碳原子的低碳基,具有3至6个碳原子的低碳烯基,具有1至6个碳原子的低碳氧基,羟基,硝基,
氨基,卤素包括
氯,
溴,
碘和
氟,苯基,具有2至6个碳原子的脂肪酰基,或它们彼此结合形成螺合到
噻吩环的
环丙烷环,并具有5至7个环状环碳原子的总数,R3是脂肪基或芳香基,例如低碳基,例如甲基或乙基。这些化合物可用作tiprinaST和相关化合物的中间体。还公开了一种I式化合物的区域选择性合成过程,其中R1为
CH3,R2为( )2CHCH2,包括在酸性条件下用
三氯乙腈反应混合物的以下公式的化合物:##STR2## 和##STR3##。