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A direct one-pot route for the synthesis of 2,2-dimethyl-2H-chromenes by Re(CO) 5 Cl-catalyzed cyclocondensation of phenols with 2-methyl-3-butyn-2-ol has been developed. The easy availability of starting materials, mild reaction conditions, high atom-efficiency, and the use of a recoverable catalyst are advantages of this procedure.
ReBr(CO) 5 -catalyzed addition of Et 2 NH and CO 2 to terminal alkynes afforded anti-Markovnikov adducts of alkenyl carbamates in good to excellent yield and high regioselectivity.
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