Ti-Catalyzed Straightforward Synthesis of Exocyclic Allenes
作者:Juan Muñoz-Bascón、Carmen Hernández-Cervantes、Natalia M. Padial、Míriam Álvarez-Corral、Antonio Rosales、Ignacio Rodríguez-García、J. Enrique Oltra
DOI:10.1002/chem.201304033
日期:2014.1.13
Exocyclicallenes constitute useful building blocks in organic synthesis and have recently been identified as key intermediates in the synthesis of natural products. Here the first general method for the most straightforwardsynthesis of exocyclicallenes reported to date is presented. This method is based on the Barbier‐type cyclization of propargyl halides catalyzed by titanium; a safe, abundant