Intermediates for preparing mono-, bi- and tricyclic amino acids

Details Intermediates for preparing mono-, bi- and tricyclic amino acids Intermediates for preparing mono-, bi- and tricyclic amino acids

1989-04-10

1990-12-11

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

544 63, 544 71, 544 72, C07D41304, C07D26502

Patent

active

049772600

ABSTRACT:
Process for preparing mono-, bi- and tricyclic amino acids, intermediates of this process, and a process for preparing same.
The invention relates to a process for preparing compounds of the formula I ##STR1## in which R stands for hydrogen, alkyl or aralkyl and R.sup.1 to R.sup.5 are identical or different radicals, (substituted) alkyl, cycloalkyl or (substituted) aryl or in which the pairs of radicals R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, and R.sup.4 and R.sup.5 together with the carbon atom(s) supporting them form a mono- or bicyclic ring system and the other radicals are hydrogen, by treating a compound of the formula II ##STR2## in which R and R.sup.1 to R.sup.5 have the abovoementioned meaning and R.sup.6 and R.sup.7 denote alkyl or aralkyl or together with the nitrogen atom supporting them form a heterocycle which can additionally contain an oxygen atom, with a reducing agent.

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