Synthesis of a new type of dibenzopyrromethene–boron complex with near-infrared absorption property

Y Kubo, Y Minowa, T Shoda, K Takeshita

Index: Kubo, Yuji; Minowa, Yu; Shoda, Takayuki; Takeshita, Kimiya Tetrahedron Letters, 2010 , vol. 51, # 12 p. 1600 - 1602

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Citation Number: 27

Abstract

A new type of π-extended 4-bora-3a, 4a-diaza-s-indacene (BODIPY dye), bis (isoindole)- derived benzo [1, 3, 2] oxazaborinine 1, has been synthesized by seven-step procedure from 2-methoxybenzoic acid methyl ester. The benzannulation of the pyrrole ring and the formation of a structurally strained intramolecular B–O ring enable the dye to absorb near- infrared light at ca. 750nm with a molecular extinction coefficient (ε) of ca 8.3× 104M− 1cm ...