Functionalization of 3,5,8-trichlorinated BODIPY dyes.
Functionalization of 3,5,8-trichlorinated BODIPY dyes.
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DOI:
10.1021/jo501969z
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发表时间:
2014-11-07
期刊:
影响因子:
--
通讯作者:
Smith KM
中科院分区:
文献类型:
--
作者:
Wang H;Fronczek FR;Vicente MG;Smith KM
Catalytic hydrogenation of dibenzyl 5-dipyrroketone-2,9-dicarboxylates followed by decarboxylative iodination affords a 2,9-diiododipyrroketone which gives a 2,5,9-trichlorodipyrromethene hydrochloride after nucleophilic addition/elimination, with adventitious chloride to replace the two iodide groups. Treatment with BF3·Et2O gives a 3,5,8-trichloro-BODIPY that readily undergoes regioselective Stille coupling at the 8-position, or homo/mixed couplings at the 3,8- or 3,5- and 8-positions. Stepwise and controlled replacement of the 3,5- and 8-chlorine atoms using Stille reagents results in formation of a completely unsymmetrical trisubstituted BODIPY. Several examples of unsymmetrical BODIPYs were synthesized and characterized using this methodology. Structure features of new BODIPYs are discussed within the context of 14 new X-ray structures, and photophysical parameters of all new BODIPY compounds are reported and discussed.
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