已经发现,通过在乙醚-四氢呋喃中用丁基锂金属化,超声波可以加速异戊烯基醇二价阴离子的形成。该二价阴离子与羰基化合物反应,然后在Wacker型条件下进行分子内缩醛化反应,为合成2-取代的全氢呋喃[2,3- b ]呋喃提供了直接途径。 金属化-超声波-聚阴离子-Wacker型反应-环化-过氢呋喃[2,3- b ]呋喃
CeCl3/NaClO: a safe and efficient reagent for the allylic chlorination of terminal olefins
作者:F.Javier Moreno-Dorado、Francisco M. Guerra、Francisco L. Manzano、F.Javier Aladro、Zacarı́as D. Jorge、Guillermo M. Massanet
DOI:10.1016/s0040-4039(03)01630-7
日期:2003.8
The preparation of allylic chlorides by reaction of terminal olefins with sodium hypochlorite in the presence of cerium trichloride heptahydrate is described. The scope, limitations and synthetic perspectives of the reaction are discussed.
Chirality Transfer in Au-Catalyzed Cyclization Reactions of Monoallylic Diols: Selective Access to Specific Enantiomers Based on Olefin Geometry
作者:Aaron Aponick、Berenger Biannic
DOI:10.1021/ol200203k
日期:2011.3.18
The gold(I)-catalyzed cyclization of monoallylic diols to form tetrahydropyrans is shown to be highly stereoselective when chiral allylic alcohols are employed. Substrates that differ only in olefin geometry provide enantiomeric products from formal SN2′ reactions in high yields with excellent chirality transfer. The allylic alcohol stereochemistry also efficiently controls the facial selectivity when
当使用手性烯丙基醇时,金(I)催化的单烯丙基二醇的环化以形成四氢吡喃显示出高度立体选择性。仅在烯烃几何形状上不同的底物以高收率和良好的手性转移提供了来自正式S N 2'反应的对映体产物。当底物包括另外的立体中心时,烯丙醇的立体化学也有效地控制了面部选择性。
Synthesis of Poly(2-substituted-1-propenylene)s from Allylic Arsonium Ylides
作者:Régis Mondière、Jean-Philippe Goddard、Géraldine Carrot、Thierry Le Gall、Charles Mioskowski
DOI:10.1021/ma047693e
日期:2005.2.1
The polymerization of several allylic triphenylarsonium ylides, which contain a pendant R group at the 2-position, in the presence of triethylborane. is described. Three initial molar ratios of ylide to triethylborane (15, 302 60) were used, leading to different degrees of polymerization. The ylide was generated from the corresponding arsonium salt, in THF at -78 degreesC: using either tert-butyllithium (when R = alkyl) or lithium hexamethyldisilazide (when R = tBuMe(2)SiOCH(2)CH(2)(-)) as the haze. After addition of triethylborane at 0 degreesC, the deep-red solution of ylide was readily discolored. Then oxidation of the resulting polymeric borane led to linear skipped polyenes containing a terminal alcohol function. These polymers can be called poly(2-substituted-1-propenylene)s. Molecular weights have been determined from both H-1 NMR analyses and size exclusion chromatography (SEC). In most, cases, the molecular weight of the polymers increases linearly with the initial ylide/triethylborane molar ratio. which gives credit to a controlled polymerization process. Block copolymers were also obtained from triethylborane by, successive additions of two different 2-substituted allylic arsonium ylides, followed by oxidation (yield: 62-85%).