Abstract
A new application of solid-supported reagents was developed to separate the alkylated N7/N9 regioisomers derived from commercially available 2-amino-6-chloropurine. Simple filtration through an alumina/H+ pad or scavenging by AG/Dowex-50W-X8 resin provides diverse N9 regioisomers selectively in moderate yields with high purities (>90%). This purification method can be conveniently used in a high-throughput format and facilitates the synthesis of a purine library without laborious regioisomer separation and aqueous work-up. The first library synthesis of 6,9-disubstituted purines is reported using the combination of this novel separation method in conjunction with polymer-supported reagents.
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