申请人:——
公开号:US04118395A1
公开(公告)日:1978-10-03
A method for the production of indolyl lactones of the formula ##STR1## wherein R.sub.1 is hydrogen, halogen, or an alkoxy group having 1 to 4 C atoms and R.sub.3 is hydrogen, characterized in the manner that one reacts a 2-hydroxymethylindole of the formula ##STR2## wherein R.sub.1 has the above named meaning and R.sub.2 is an alkanoyl group or a phenyl alkanoyl group, with an .alpha.-diazoester of the formula ##STR3## wherein R.sub.3 has the above named meaning and R.sub.4 is an alkyl group having 1 to 4 C atoms and a, benzyl group, to a 3-indolyl acetic acid ester of the formula ##STR4## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 have the above named meanings, saponifies the thus obtained 3-indolyl acetic acid ester of the formula (IV) to the 3-indolyl acetic acid of the formula ##STR5## wherein R.sub.1 and R.sub.3 have the above named meaning, and the latter is dehydrated to indolyl lactone with the formula (I).
一种制备式为##STR1##的吲哚内酯的方法,其中R.sub.1为氢、卤素或具有1至4个碳原子的烷氧基,R.sub.3为氢,其特征在于将式为##STR2##的2-羟甲基吲哚(其中R.sub.1具有上述命名的含义,R.sub.2为烷酰基或苯基烷酰基)与式为##STR3##的.alpha.-重氮乙酸酯(其中R.sub.3具有上述命名的含义,R.sub.4为具有1至4个碳原子的烷基和苄基)反应,得到式为##STR4##的3-吲哚乙酸酯,将所得的式(IV)的3-吲哚乙酸酯皂化为式为##STR5##的3-吲哚乙酸(其中R.sub.1和R.sub.3具有上述命名的含义),并将后者脱水为式(I)的吲哚内酯。