Journal of labelled compounds and radiopharmaceuticals 1994, 34, 11-16
作者:
DOI:——
日期:——
Synthesis of [3H]CI-980, ethyl[5-anino-1,2-dihydro-2(S)-methyl-3(3-[3H]phenyl)pyrido[3,4-b]jpyrazin-7-YL] carbamate isethionate salt, a tubulin-binding, antimitotic, broad-spectrum antitumor agent
作者:Helen T. Lee、Peter W. K. Woo
DOI:10.1002/jlcr.2580340103
日期:1994.1
[3H]CI-980 (10b) was synthesized in an eight-step sequence with an overall yield of 2.4%. Reaction of m-bromophenyl lithium (2) with N-ethoxycarbonyl-L-alanine gave the chiral ketone 3. Reduction of 3 with sodium borohydride followed by alkaline N-deprotection and condensation with ethyl 6-amino-4-chloro-5-nitro-2-pyridine carbamate (6) gave 7. Chromium trioxide oxidation of 7 followed by reductive cyclization with iron-acetic acid gave the key bromo intermediate 9. Palladium catalyzed 3H-hydrogenolysis of 9 gave the free base form of [3H]CI-980 (10a), which was converted to the isethionate salt (10b) before use.