Lewis acid-catalyzed benzannulation via unprecedented [4+ 2] cycloaddition of o-alkynyl (oxo) benzenes and enynals with alkynes

N Asao, T Nogami, S Lee…

Index: Hanazawa, Takeshi; Sasaki, Kousuke; Takayama, Yuuki; Sato, Fumie Journal of Organic Chemistry, 2003 , vol. 68, # 12 p. 4980 - 4983

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Citation Number: 274

Abstract

... Journal of the American Chemical Society. ... J. Am. Chem. Soc. ... 2 Recently, Sato reported a new type of acetylene trimerization via titanacycles 3 and Takahashi reported a new style of benzannulation through zirconacycles, 4 although those processes are not catalytic. ...