Azidomercurations of Alkenes: Mercury-Promoted Schmidt Reactions
作者:William H. Pearson、Daniel A. Hutta、Wen-kui Fang
DOI:10.1021/jo001181q
日期:2000.12.1
the mercury-promoted Schmidtreaction has several advantages. First, the acid-promoted Schmidtreaction of azido-alkenes requires that the intermediate carbocations be tertiary, allylic, benzylic, or propargylic. The mercury-promoted method has no such limitation; thus even 1,2-disubstituted alkenes may be used. Second, the mercury-promoted method is milder, allowing the presence of acid-sensitive functionality
A study on the regio- and stereoselectivity in palladium-catalyzed cyclizations of alkenes and alkynes bearing bromoaryl and nucleophilic groups
作者:Didier Bruyère、Didier Bouyssi、Geneviève Balme
DOI:10.1016/j.tet.2004.03.023
日期:2004.4
We have studied the remarkable dependence of the stereochemistry of the cyclization on the double bond geometry and of the effect of the bulkiness of the nucleophile on the regiochemistry of the palladium mediated cyclization of alkenes bearing aryl bromides and nucleophiles. In contrast, the cyclization of the acetylenic homologous substrates is not dependent on the nature of the nucleophile.
Process for preparing Estrogen-antagonistic 11 beta-Fluoro-17alpha-alkylestra-1,3,5(10)-triene-3,17-diols having a 7alpha-(xi-Alkylamino-omega-perfluoroalkyl)alkyl side chain and alpha-Alkyl(amino)-omega-perfluoro(alkyl)alkanes and Processes for their Preparation
申请人:SANDER Michael
公开号:US20090062558A1
公开(公告)日:2009-03-05
The present invention relates to a new process for preparing estrogen-antagonistic 11β-fluoro-17α-alkylestra-1,3,5(10)-triene-3,17-diols of the general formula I having a 7α-(ξ-alkylamino-ω-perfluoroalkyl)alkyl side chain and to α-alkyl(amino)-ω-perfluoro(alkyl)alkanes of the general formula II, to processes for their preparation and to the intermediates required for this purpose.
New developments in the Pd-catalysed cyclisation-coupling reaction of alkene-containing carbonucleophiles with organic halides (and triflates). The first examples of asymmetric catalysis.
The results of our preliminary investigations directed toward asymmetric catalysis of the cyclocarbopalladation of alkenes bearing a proximate nucleophile with organic halides (or triflates) are disclosed. A series of bidentate phosphine ligands were evaluated in intramolecular versions of this reactionusing (E)-2-[7-(2-bromophenyl)-hept-4-enyl]-malonic acid dimethyl ester (1) and (Z)-2-[7-(2-tri
公开了我们的初步研究结果,该研究针对带有近亲核体的烯烃与有机卤化物(或三氟甲磺酸酯)的不对称催化环碳链烷烃化反应。使用(E)-2- [7-(2-溴苯基)-庚-4-烯基]-丙二酸二甲酯(1)和(Z)-2在该反应的分子内形式中评估了一系列双齿膦配体-[7-(2-三氟甲磺酰氧基-苯基)-庚-4-基]-丙二酸二甲酯(9)作为模型底物。用三氟甲磺酸芳基酯9可获得最高的对映选择性诱导,通过使用PdCl 2可以产生54%的化学收率和43%ee的相应的环戊基茚满,为单一的非对映异构体。[ S -(-)-TolBINAP]为手性催化剂,K 2 CO 3为碱。