The invention provides certain (phenyl)-(pyrazol)-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-onecompounds of formula I as D1 positive allosteric modulators (PAMs), and pharmaceutical compositions thereof. The invention further provides methods of using a compound of formula I, or a pharmaceutically acceptable salt thereof, to treat certain symptoms of Parkinson’s disease, schizophrenia, ADHD or Alzheimer’s disease.本發明提供某些式I之(苯基)-(吡唑)-3,4-二氫異喹啉-2(1H)-基)乙-1-酮化合物作為D1正向異位調節劑(PAM)及其醫藥組合物。本發明進一步提供使用式I化合物或其醫藥學上可接受之鹽來治療帕金森氏病、精神分裂症、ADHD或阿茲海默氏病的某些症狀之方法。