Abstract
We present here our results on the preparation of 2-alkynylbenzyl
selenide and sulfide derivatives via Sonogashira cross-coupling
of benzyl chalcogenides with different alkynes. This cross-coupling
reaction proceeded cleanly under mild conditions and was performed
with propargyl alcohol as well as alkyl- and arylalkynes. Subsequent
electrophilic-cyclization reaction of the 2-alkynylbenzyl selenide
and sulfide derivatives using iodine as an electrophilic source
gave 4-iodo-3-substituted 1H -isoselenochromenes
and -isothiochromenes in moderate yields. The unique product obtained
during the course of this cyclization contained a six-membered ring
which was confirmed by X-ray diffraction analysis.
Key words
selenides - isochromenes - electrophilic cyclization - heterocycles
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