M. Ishikura et al., A CONCISE ACCESS TO 2-ALLENYLINDOLE DERIVATIVES BASED ON THE PALLADIUM-CATALYZED CROSS-COUPLING REACTION OF INDOLYLBORATES, Tetrahedron, 54(46), 1998, pp. 13929-13942
The palladium catalyzed cross-coupling reaction of trialky](indol-2-yl
)borates with prop-2-ynyl carbonates was developed for the preparation
of 2-allenylindole derivatives. When the reaction of indolyl-borates
with tert-prop-2-ynyl carbonates was carried out. 2-allenylindoles wer
e obtained solely. Otherwise, indolylborates reacted with sec-prop-2-y
nyl carbonates, giving rise to 2-allenylindoles and/or 3-(prop-2-ynyl)
indoles depending on the catalyst used. (C) 1998 Elsevier Science Ltd.
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