Synthesis of 5-methylene-1,3-cyclohexadienes (o-isotoluenes) via electrocyclization of (4Z)-1,2,4,6-heptatetraenes
作者:Kung K. Wang、Quan Zhang、Junkai Liao
DOI:10.1016/0040-4039(96)00774-5
日期:1996.6
1-lithio-3,4-pentadien-1-ynes derived from 10 followed by trimethyltin chloride and acetic acid furnished o-isotoluenes 13 in a single operation. The reaction proceeded through an initial formation of diene-allenes 11, which underwent facile electrocyclizations to produce 12 leading to o-isotoluenes 13.
Palladium-Catalyzed Cross-Coupling Reaction of Triorganoindium Reagents with Propargylic Esters
作者:Ricardo Riveiros、David Rodríguez、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1021/ol060192o
日期:2006.3.1
[reaction: see text] Triorganoindiumreagents (R(3)In) react with propargylic esters under palladium catalysis via an S(N)2' rearrangement to afford allenes in good yields and with high regioselectivity. The reaction proceeds smoothly at room temperature with a variety of R(3)In (aryl, alkenyl, alkynyl, and methyl). When chiral, nonracemic propargylic esters are employed, the reaction takes place with