Abstract
New preparations of crystalline Vilsmeier reagent (VR) and dichloromethyl propyl or butyl ether were developed. The methods are environmentally benign and applicable to large-scale synthesis. Formylations of 1H-pyrrole-2-carboxylates were achieved with these reagents, regioselectively affording the 4-formyl and 5-formyl derivatives in nearly quantitative yields.
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