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An efficient potassium cyanide-promoted synthesis of 2-arylbenzoxazoles from [4.3.0]boron heterobicycles

✍ Scribed by Heraclio López-Ruiz; Horacio Briseño-Ortega; Susana Rojas-Lima; Rosa Santillán; Norberto Farfán

Publisher
Elsevier Science
Year
2010
Tongue
French
Weight
250 KB
Volume
51
Category
Article
ISSN
0040-4039

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✦ Synopsis

a b s t r a c t

The 2-arylbenzoxazoles 3a-f were produced in moderate to excellent yields merely by stirring a potassium cyanide (3 equiv)-containing methanol solution of the borobicyclic compounds 1a-f at room temperature. These compounds were fully characterized spectroscopically [IR, 1 H, and 13 C NMR and X-ray analysis (3a)] and by elemental analysis.

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## Abstract Simple and improved conditions have been found to carry out the Biginelli reaction for the synthesis of 3,4‐dihydropyrimidin‐2(1__H__)‐one derivatives. This synthesis was performed using potassium hydrogen sulfate as the promoter in ethylene glycol solution. Compared with the classical