An economic and environmental synthestic method for 3-chloroindenes from o-(alkynyl)styrenes through tandem reactions including choropalladation/Heck cross coupling in Pd/O 2 system was reported. Taking green dioxygen as sole oxidant and LiCl as chlorine source, 13 functionalized 3-chloroindenes could be synthesized in moderate to high yield without the addition of CuCl 2

A remarkably simple, mild and efficient approach for carbon-carbon bond cleavage of β-keto amides using N-bromobutanimide (NBS) as the bromine source and acetic acid as the catalyst to construct α-dibromosubstituted arylamides is achieved. Moreover, tandem carbon-bromine bond formation, followed by protonation of carbonyl and cleavage of C-C bond in one pot has also been demonstrated. All the reactions were carried out under extremely mild conditions and provided almost quantitative yields of the products.

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