A wide variety of 3-halospiro [4.5] trienones are readily prepared in good to excellent yields
by the intramolecular ipso-halocyclization of 4-(p-methoxyaryl)-1-alkynes under mild …

A new, general method for the synthesis of spiro [4, 5] trienones is described by the
intramolecular ipso-halocyclization of 4-(p-unsubstituted-aryl)-1-alkynes. In the presence of …

A wide variety of 3-iodobenzo [b] furans were readily prepared by iodocyclization of 2-
alkynyl-1-(1-ethoxyethoxy) benzenes with the I (coll) 2PF6− BF3· OEt2 combination. Aryl …

The electrophilic cyclization of 2-(1-alkynyl)-2-alken-1-ones in the presence of various
alcohols or carbon-based nucleophiles offers an efficient and straightforward route to highly …

A general and efficient intramolecular electrophilic ipso-iodocyclization of para-unactivated
arylalkynes has been developed for the synthesis of spiro [4, 5] trienyl acetates. In the …

tert-Butyl hypoiodite (t-BuOI) was found to be a powerful reagent for the cyclization of N-
alkenylamides leading to a variety of N-heterocycles under extremely mild conditions. When …

A novel and selective method for the synthesis of 8-methylenespiro [4, 5] trienes via
intramolecular electrophilic ipso-iodocyclization of N-(4-methylphenyl) propiolamides has …

Five-membered ring annulation via propargyl- and allylsilanes Page 1 6094 J. Org. Chem.
57, 6094-6097 synthesis of a- and 5-C-glycosyl aldehydes.22,25 The reaction of these …

A highly effective method for the synthesis of the core indolo [2, 3-a] quinolizidine skeleton
found in yohimbine is described. The reaction of N-monosubstituted thioamides with …

Triphenylphosphine promoted addition of dimethyl acetylenedicarb- oxylate to 1,2-benzoquinones:
facile synthesis of novel γ-spi Page 1 J. Chem. Soc., Perkin Trans. 1, 1997 3129 …