Diiodoindium(III) Cation, InI<sub>2</sub><sup>+</sup>, a Potent Yneophile. Generation and Application to Cationic Cyclization by Selective π-Activation of C≡C
作者:Karavadhi Surendra、E. J. Corey
DOI:10.1021/ja506502p
日期:2014.8.6
The removal of the iodide ion from indium triiodide by means of reactive Ag(I) salts leads to the formation of the highly reactive ligandless cation InI2+, which is unusual in having two vacant low-lying p-orbitals. This bivalent Lewis acidity leads to an especially high affinity for the two orthogonal pi-bonds of carbon-carbon triple bonds. Consequently, the double-coordinating InI2+ is an especially effective reagent for the selective activation of C C and the catalytic initiation of cationic cyclization processes. A number of such reactions are described to demonstrate synthetic utility.
A Powerful New Construction of Complex Chiral Polycycles by an Indium(III)-Catalyzed Cationic Cascade
作者:Karavadhi Surendra、Wenwei Qiu、E. J. Corey
DOI:10.1021/ja204142n
日期:2011.6.29
InI(3) and InBr(3) have been found to be effective catalysts for the π activation of C≡C bonds to initiate the conversion of chiral propargylic alcohols or silyl ethers to polycyclic products in excellent yields and with high stereoselectivity. The method has been applied to the synthesis of chiral fused hexacyclic ring systems with the creation of multiple new stereocenters. The power and scope of