Process for the preparation of thieno(2,3-c)- and thieno(3,2-c)p

Details Process for the preparation of thieno(2,3-c)- and thieno(3,2-c)p Process for the preparation of thieno(2,3-c)- and thieno(3,2-c)p

1978-05-23

1979-07-17

Rotman, Alan L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C09S49504

Patent

active

041615999

ABSTRACT:
This invention relates to a process for the preparation of derivatives having the formula: ##STR1## in which R is hydrogen or the carboxy group, comprising reacting a compound of the formula ##STR2## with nitrous acid, to give, respectively, the compounds of the formulae: ##STR3## and then removing the nitroso group from the compounds of the formulae (V) and (VI), respectively, either by reaction with an acid, to give the derivatives of the formulae (I) and (II), respectively, in which R is hydrogen, or by reaction with an alkali metal hydroxide and subsequent neutralization, to give the derivatives of the formulae (I) and (II), respectively, in which R is the carboxy group.

REFERENCES:
patent: 3969358 (1976-07-01), Amsalem
patent: 3981861 (1976-09-01), Ziemek
patent: 3997545 (1976-12-01), Kuwada et al.
patent: 4075340 (1978-02-01), Maffrand
patent: 4076819 (1978-02-01), Maffrand
patent: 4097482 (1978-06-01), Amsalem
Farnier et al., Canadian Journal of Chemistry, vol. 54, No. 7, Apr. 1, 1976.

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