This invention provides novel processes for the preparation of compounds such as 3-[(1S,2S)-2-hydroxycyclohexyl]-6-[(6-methylpyridin-3-yl)methyl]benzo[h]-quinazolin-4(3H)-one, salts and derivatives thereof. The compounds synthesized by the processes of the invention are useful for treating Alzheimers disease and other diseases (e.g., cognitive impairment, schizophrenia, pain disorders, and sleep disorders) mediated by the muscarinic M1 receptor.