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An improved procedure for the Blaise reaction: a short, practical route to the key intermediates of the saxitoxin synthesis

Steven M. Hannick, Yoshito Kishi*

*Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, Email:

S. M. Hannick, Y. Kishi, J. Org. Chem., 1983, 48, 3833-3835.

DOI: 10.1021/jo00169a053

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Slow addition of 3 - 5 eq. of α-bromo esters to aliphatic or aromatic nitriles in the presence of activated zinc in refluxing tetrahydrofuran yielded the corresponding enamino esters or, after acid hydrolysis, β-keto esters. Slow addition and use of tetrahydrofuran as solvent substantially improved the yield of the Blaise reaction and also enabled the conversion of bromoacetates to give α-unsubtituted products.

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Key Words

Blaise Reaction, β-enamino esters

ID: J42-Y1983-180