Process for the preparation of polycyclic compounds

Details Process for the preparation of polycyclic compounds Process for the preparation of polycyclic compounds

1990-04-18

1991-10-01

Bond, Robert T.

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

Organic compounds

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

540468, C07D52100

Patent

active

050535102

ABSTRACT:
The invention relates to a process for the preparation of a compound of formula ##STR1## or a salt thereof, wherein R.sub.1 is hydrogen or trialkylacetyl, R.sub.2 is hydrogen or acetyl and R.sub.3 is alkyl, which process comprises cyclising a compound of formula ##STR2## wherein R.sub.1 is trialkylacetyl and, if desired, converting a compound of formula I obtainable by said process or in another manner, or a salt thereof, into another compound of formula I or a salt thereof, or converting a resultant free compound of formula I into a salt and/or a resultant salt into the free compound of formula I or into another salt.

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