Diverse Reactivity of Zirconacyclocumulenes Derived from Coupling of Benzynezirconocenes with 1,3‐Butadiynes towards Acyl Cyanides: Synthesis of Indeno[2,1‐<i>b</i>]pyrroles or [3]Cumulenones

Abstract

Versatility: Cycloaddition of carbamoyl cyanides to 1,3-butadiynes via seven-membered zirconacyclocumulenes yields dihydroindeno[2,1-b]pyrroles (see scheme, right); a C(sp2)H bond on the aromatic substituent of the 1,3-butadiyne reactant is activated in the process. In contrast, reactions with aryl or alkyl acyl cyanides provide a stereoselective route to cis-[3]cumulenones (left). Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.