Process for preparing thiophene derivatives

Details Process for preparing thiophene derivatives Process for preparing thiophene derivatives

1988-08-16

1990-01-16

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23500

Patent

active

048944637

ABSTRACT:
Thiophene derivatives of the general formula ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each are hydrogen or lower acyl and R.sub.6 is hydrogen or lower alkyl, are prepared by the reaction of a compound of the general formula ##STR2## wherein R.sub.3 is lower alkyl, R.sub.4 and R.sub.5 are lower acyl and X is chlorine, bromine or iodine, with a strong basic quaternary ammonium anion exchange resin in the monothiophosphate form to form a polymer intermediate product of the formula ##STR3## wherein R.sub.3, R.sub.4, and R.sub.5 have the significances given above, and (P).sup.+++ represents a polymer cation, which after purification in an acidic medium is reacted to the thiophene derivative of formula (I).
The invention further relates to the novel polymer compound of formula (III) obtained in this process as an intermediate product.

REFERENCES:
patent: 4044020 (1977-08-01), Marx et al.
patent: 4782165 (1988-11-01), Sklavounos

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