Studies toward the synthesis of cinachyramine. An efficient route to 1,5-diazabicyclo[4.4.0]dec-5-enes.

ABSTRACT: Hydrogenation (3 atm) of readily available pyrido[1,2-a]pyrimidines 10, 14, and 17 over 5% Rh/Al₂O₃ forms 1,5-diazabicyclo[4.4.0]dec-5-enes 9, 15, and 18 in > 95% yield, providing a general route to this little-studied class of compounds. All attempts to form the tetrahydro-1,2,4-triazine moiety of cinachyramine (1) by rearrangement of amidinium dimethylhydrazone 8 using the procedures developed by Kamatori to convert hydrazone 3a to tetrahydro-1,2,4-triazine 4a were unsuccessful.

SUBMITTER: Barykina-Tassa OV 

PROVIDER: S-EPMC4472388 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature