The first chemoselective tandem acylation of the Blaise reaction intermediate: a novel method for the synthesis of a-acyl-b-enamino esters, key intermediate for pyrazoles.

[摘要]：The Blaise reaction intermediate, a zinc bromide complex of b-enamino ester, could be activated in situ by addn. of a stoichiometric or catalytic amt. of n-BuLi to allow chemoselective tandem C2-acylation providing a-acyl-b-enamino esters, e.g., I, which are valuable intermediates for the syntheses of tri- and tetrasubstituted pyrazoles.

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