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Anrorc-mechanism in the amino-deoxogenation of oxoheterocycles with phenyl phosphorodiamidate

✍ Scribed by A.P. Kroon; H.C. van der Plas

Book ID
104242983
Publisher
Elsevier Science
Year
1974
Tongue
French
Weight
100 KB
Volume
15
Category
Article
ISSN
0040-4039

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✦ Synopsis

It was further observed that on a renewed treatment of 4 with PPDA (235OC, 45 min) 15 N exchange occurs since in the 4_aminoquinazoline, recovered after the reaction, 2.8% of 15 N is present and in the 4-oxoquinazoline only 1.1% of 15 N. This result indicates that at these conditions a ring opening -ring closure sequence can take place with 4. Although the decrease of 15 N-content -

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During a recent investigation of the tine-amination of 4-substituted 5-bromopyrimidines by potassium amide in liquid ammonia2 it was observed that !+bromo-4,6\_dimethoxypyrimidine (la)3 -