A cadmiumsulfide quantum‐dot‐photocatalyzed C(sp3)−Cl bond cleavage of ethyl chlorodifluoroacetate and cascade cyclization with unactivated olefins is described herein. This reaction provides a cost‐efficient method for synthesizing a wide range of CF2‐containing azaheterocycles from a variety of functionalized difluoromethyl chlorides. Furthermore, the results of a preliminary anti‐proliferative