short new azulene synthesis, requiring no dehydrogenation step, has been developed (Scheme I). Intramolecular carbene addition creates the bicyclic ring system of azulene with a high degree of unsaturation and versatile functionality in a single step from a simple benzene derivative. The synthesis is particularly amenable to preparation of specific /sup 13/C- and /sup 2/H-labeled azulenes.
Regiospecific synthesis of α-(phenylthio)cycloalkenones and of α-phenyl-α-(phenylthio) ketones VIA αα-addition of phenylsulphenyl chloride to ∢-diazoketones
作者:M.Anthony McKervey、Pinit Ratananukul
DOI:10.1016/s0040-4039(00)81343-x
日期:1983.1
phenylsulphenyl chloride at room temperature to furnish α-chloro-α-(phenylthio)cycloalkanones which undergo ready dehydrochlorination to α-(phenylthio)cycloalkenones when treated with triethylamine; acyclic, terminal α-diazoketones also furnish α-chloro-α-(phenylthio)adducts which are useful electrophiles in the synthesis of α-phenyl-α-(phenylthio)ketones.
The intramolecular Buchner reaction of aryl diazoketones. Substituent effects and scope in synthesis
作者:Michael Kennedy、M. Anthony McKervey、Anita R. Maguire、Sarbajna M. Tuladhar、M. Fiona Twohig
DOI:10.1039/p19900001047
日期:——
cyclisation occurring in all cases. When the precursor contains a meta-methoxy substituent, 2-tetralones are obtained directly. The efficient conversion of 3-phenylpropionic acid into trans-1-methylbicyclo[5.3.0]decan-2-one is also described, partial asymmetric synthesis having been realised through the use of rhodium (S)-mandelate as the cyclisation catalyst. Cyclisations of diazoketonesderived from