A. Kumar et al., Gas-phase pyrolysis in organic synthesis. Part 3: Novel cyclization of 2-arylhydrazonopropanals into cinnolines, INT J CH K, 33(7), 2001, pp. 402-406
3-oxo-3-aryl-2-arylhydrazonopropanals (1) have been converted under thermal
gas-phase conditions cleanly into cinnolines (2). A plausible mechanism is
suggested to account for this transformation based on the kinetics and pro
ducts of reaction. (C) John Wiley & Sons, Inc.