
Tetrahedron Letters p. 75 - 78 (1983)
Update date:2022-08-18
Topics:
Kataoka, Tadashi
Tomimatsu, Kiminori
Shimizu, Hiroshi
Hori, Mikio
Stereoisomers of 9-substituted selenoxanthen-10-io(alkoxalyl alkoxycarbonyl)methanides were prepared from the corresponding selenoxides and activated acetylenes.In the reaction of 9-phenylselenoxanthene 10-oxide(1c) with methyl propiolate afforded an unexpected product, methyl 9-phenylselenoxanthen-9-ylpropiolate(5) together with ylide(2e).The selenonium ylides underwent new reductive cyclization with sodium borohydride to afford new cyclic selenonium ylides.
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