Yield:-

Steps:

Multi-step reaction with 3 steps
1.1: N-ethyl-N,N-diisopropylamine; n-butyllithium / tetrahydrofuran; hexane / 1.25 h / -78 - 25 °C / Inert atmosphere; Green chemistry
1.2: Inert atmosphere; Green chemistry
2.1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione; hydrogenchloride / water / 3 h / 50 - 70 °C / Green chemistry
3.1: potassium carbonate / toluene / 1.5 h / Reflux; Green chemistry; Large scale

References:

Li, Chaojie;Liu, Yuxiu;Wang, Qingmin [Tetrahedron Letters,2014,vol. 55,# 4,p. 950 - 953]

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