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This study describes the design and synthesis of arylboronic acid 2, the first example of a permanently open "frustrated" benzoxaborole, along with an exploration of its application in bioconjugation. An efficient and high yielding seven-step synthesis was optimized. NMR experiments confirmed that compound 2 exists in the open ortho-hydroxyalkyl arylboronic acid structure 2-I, a form that is effectively prevented to undergo a dehydrative cyclization as a result of unfavorable geometry. Compound 2-I conjugates effectively with amines to fo
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