Double agent: The direct α‐difluoromethylation of lithiumenolates using an umpolung form of fluoroform as a difluoromethyl carbocation equivalent leads to an all‐carbon quaternary center. Late transition metals are not necessary and the reaction involves activation of inert CF bonds with subsequent CCbond formation.
An Interrupted Fischer Indolization Approach toward Fused Indoline-Containing Natural Products
作者:Ben W. Boal、Alex W. Schammel、Neil K. Garg
DOI:10.1021/ol901383j
日期:2009.8.6
An efficient method to access the fused indoline ring system present in a multitude of bioactive molecules has been developed. The strategy involves the condensation of hydrazines with latent aldehydes to ultimately deliver indoline-containing products by way of an interrupted Fischer indolization sequence. Our studies show that the approach will likely be amenable to the synthesis of complex targets, such as the communesin natural products.