La methylene-6 prostaglandine E 1 est preparee par alkylation de la (4D) [(t-butyldimethylsiloxy)]-4 phenylseleno-2 cyclopentene-2one par un caprate suivie d'une allylation photochimique avec un allylstannane. Son ozonolyse suivie d'une desilylation et d'une hydrolyse donne la oxo-6 prostaglandine E 1 naturelle
La 亚甲基-6 前列腺素 E 1 est preparee par 烷基化 de la (4D) [(t-丁基二甲基甲硅烷氧基)]-4 phenylseleno-2 cyclopentene-2one par un caprate suvie d'une allylation photochimique avec un allylstannane。Son ozonolyse suivie d'une desilylation et d'une 水解 donne la oxo-6 prostaglandine E 1 naturelle
Design of Polyaromatic Hydrocarbon-Supported Tin Reagents: A New Family of Tin Reagents Easily Removable from Reaction Mixtures
作者:Didier Stien、Stéphane Gastaldi
DOI:10.1021/jo049868o
日期:2004.6.1
We report in this paper the preparation and use of stannanes 11, 12a, and 12b, compounds whose 3-pyrenylpropyl side chain affinity for activated carbon simplifies tin removal and product isolation. Our pyrene-supported reagents can be used for radical reductions and cyclizations (11), radical and cationic allylations (12a), and Stille couplings (12b) in much the same way as tributyltin derivatives
An Allylstannane Reagent on Non-Cross-Linked Polystyrene Support
作者:Eric J. Enholm、Maria E. Gallagher、Kelley M. Moran、Jennifer S. Lombardi、James P. Schulte
DOI:10.1021/ol990613k
日期:1999.9.1
[GRAPHICS]A new allylstannane reagent on non cross linked polystyrene was developed for the first time. This support differs markedly from standard cross-linked polymers because it is completely soluble in organic solvents; moreover, the reactions can be conveniently monitored directly by standard H-1 NMR methods. The allylstannane underwent a free radical reaction with an alkyl halide to form a new allyl appendage. Tin byproducts can be easily recovered from cold methanol as white crystalline solids.
An Efficient Synthesis of (±)-Grandisol Featuring 1,5-Enyne Metathesis
作者:Thomas J. A. Graham、Erin E. Gray、James M. Burgess、Brian C. Goess
DOI:10.1021/jo9020375
日期:2010.1.1
An eight-step synthesis of (±)-grandisol features a key sequence involving a high-yielding, microwave-assisted enyne metathesis to yield a 1-alkenylcyclobutene that is semihydrogenated to yield a silyl-protected grandisol. Metathesis catalyst screens revealed an intriguing trend whereby substrate conversion correlated strongly with the identity of the ligands on the catalyst. In addition, new reactivity