Process for preparing benzopyrano (2,3-d) triazoles

Details Process for preparing benzopyrano (2,3-d) triazoles Process for preparing benzopyrano (2,3-d) triazoles

1985-11-12

1987-09-08

Daus, Donald G.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

544368, 548256, 548259, C07D41300

Patent

active

046925260

ABSTRACT:
A process for preparing a compound of formula (I) ##STR1## wherein X phenyl optionally substituted by one halogen, C.sub.1-4 alkyl or C.sub.1-4 alkoxy; or pyridyl; R.sup.1 is hydrogen or C.sub.1-6 alkyl; and n is an integer of from 1 to 6; which process comprises, cyclizing a compound of formula (II): ##STR2## wherein X, R.sup.1 and n are as defined in relation to formula (I); Y is an hydroxy or an acid activating group and R.sup.x is hydrogen or an N- protecting group and thereafter if desired carrying out one or more of the following steps: (i) removing any protecting group R.sup.x, (ii) preparing a salt of the compound of formula (I).

REFERENCES:
patent: 4248879 (1981-02-01), Buckle et al.
patent: 4405620 (1982-09-01), Buckle et al.
patent: 4427686 (1984-01-01), Buckle et al.
Buckle et al., Chem. Abst. 96-35 265z.

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