The flow thermolyses of 1-isobutenyl alkynyl- and 2-methylphenyl alkynyl ketones. Synthesis of methylenomycin B
作者:Manuel Roller、Martin Karpf、André S. Dreiding
DOI:10.1016/s0040-4039(00)83928-3
日期:1986.1
lead to phenols and to cyclopentenones. The results are explained by a 5-ring carbene process (the known α-alkynone cyclization) and a 6-ring as well as a 5-ring addition process. The latter two (novel) processes are thought to be intramolecular “CH to CC additions” in two directions. The 5-ring addition process was used in a short (but low yield) synthesis of methylenomycinB.