1-(3-Chloropyridin-4-yl)ethan-1-amine (CAS# 1149588-22-6) is an intermediate in preparation of pyridazinone derivatives used as P2X7 receptor inhibitors; useful in the treatment of rheumatoid arthritis (ref 1) and also in preparation of N-biphenylmethylindole modulators of PPARG for treatment of osteoporosis (ref 2).