Polyborylation of azulenes

M Fujinaga, T Murafuji, K Kurotobi, Y Sugihara

Index: Fujinaga, Masayuki; Murafuji, Toshihiro; Kurotobi, Kei; Sugihara, Yoshikazu Tetrahedron, 2009 , vol. 65, # 34 p. 7115 - 7121

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Citation Number: 10

Abstract

In the presence of an active Ir-based catalyst, azulene underwent stepwise borylation with bis (pinacolato) diboron to produce polyborylated products. The reactivity of the ring atoms toward borylation was found to decrease in the following order: 2-position> 1, 3-positions> 6- position> 5, 7-positions. Extension of the borylation to some azulenes substituted at the five- membered ring was also examined. Furthermore, the reaction of 2, 6-bis (4, 4, 5, 5- ...