合成 de methyl-3,4aethyl-2 perhydrovinyl-5 furo [2,3-b] furannediol-3,4 a partir de la photocycloaddition du dimethyl-3,4 furanne et du benzyloxy-3 propanal
Synthesis of a Dimethylfuran-Containing Macrolide Insect Pheromone
作者:Richard J. Petroski、Robert J. Bartelt、Karl Vermillion
DOI:10.1080/00397910802527748
日期:2009.3.25
macrolide pheromone (1) of Galerucella beetles was shortened from 13 steps in the original synthesis to 10 steps, and the overall yield was increased greater than six-fold. A concise Reformatsky-based sequence of reactions was utilized to construct the key precursor, 2,3-dimethyl-2-butenolide. Reduction of the butenolide with diisobutylaluminum hydride afforded 3,4-dimethylfuran. A one-pot sequence of lithiation
Asymmetric (4+3) Cycloadditions of Enantiomerically Enriched Epoxy Enolsilanes
作者:Brian Lo、Sarah Lam、Wing-Tak Wong、Pauline Chiu
DOI:10.1002/anie.201207427
日期:2012.11.26
A f(oxy) allyl: The intermolecular (4+3) cycloaddition of enantiomericallyenriched epoxy enolsilanes produces cycloadducts with up to 99 % ee, thus implying the reaction does not proceed by the putative achiral oxyallyl cation intermediate, but through a transiently chiral electrophile which retains the stereochemical information of the epoxide (see scheme; TES=triethylsilyl, Tf=trifluoromethanesulfonyl)
We report the first asymmetric Diels–Alderreactionbetween furan and propiolates. Propiolate, a dienophile, was equipped with an Evans’ auxiliary and a sulfonyl group to control and facilitate diastereoselective cycloaddition. Treatment with furan as a diene and aluminium Lewis acid afforded a 7-oxabicyclo[2.2.1]heptadiene skeleton diastereoselectively. The origin of diastereoselectivity can be explained
Concurrent Anodic Cyanation and Methoxylation of Methylated Furans. Oxidation Potential and Reactivity, and Stereochemical Control of Addition
作者:Kunihisa Yoshida、Takayuki Fueno
DOI:10.1246/bcsj.60.229
日期:1987.1
The potentiostatic electrooxidation of a series of methyl-substituted furans was performed in MeOH that contains NaCN at a Pt anode in a divided cell. In all instances, the 1,4-additions of cyano and/or methoxyl group(s) across the furan ring were achieved. Replacement of an aromatic hydrogen by a cyano group occurred concurrently in some cases. The relative rates of cation radicals toward two different