Gold(III) Chloride-Catalyzed 6-<i>endo</i>-<i>trig</i>Oxa-Michael Addition Reactions for Diastereoselective Synthesis of Fused Tetrahydropyranones
作者:Jennifer Ciesielski、David Lebœuf、Harry A. Stern、Alison J. Frontier
DOI:10.1002/adsc.201300265
日期:2013.7.8
treated with boron trifluoride diethyl etherate to generate β‐iodoallenolates, which underwent intramolecular aldol reactions to produce cycloalkenyl alcohols. Diastereoselective oxa‐Michael ring closure could then be induced by treatment with a catalytic amount of gold(III) chloride, affording highly functionalized tetrahydropyranone‐containing ring systems.
β-Iodoallenolates as Springboards for Annulation Reactions
作者:Jennifer Ciesielski、Daniel P. Canterbury、Alison J. Frontier
DOI:10.1021/ol901721y
日期:2009.10.1
and a Lewis acid, underwent selective single or double annulation, depending on the Lewis acid promoter. Treatment with TiCl4 gave cyclohexenyl alcohols III, whereas BF3·OEt2 gave oxadecalins IV. The scope and limitations of the two annulation reactions are described.
Cascade Cyclizations of Acyclic and Macrocyclic Alkynones: Studies toward the Synthesis of Phomactin A
作者:Jennifer Ciesielski、Vincent Gandon、Alison J. Frontier
DOI:10.1021/jo4007514
日期:2013.10.4
closure, while cyclizations using BF3·OEt2 as promoter occurred reversibly. For both acyclic and macrocyclic alkynones, high diastereoselectivity was observed in the intramolecular aldol reaction. The MgI2 protocol for cyclization was applied to the synthesis of advanced intermediates relevant to the synthesis of phomactin natural products, during which a novel transannular cation–olefin cyclization was