PdCl2-Catalyzed Efficient Transformation of Propargylic Amines to (E)-α-Chloroalkylidene-β-lactams
摘要:
The PdCl2-catalyzed cyclocarbonylation reaction of propargylic amines with CuCl2 and benzoquinone afforded (E)-alpha-chloroalkylidene-beta-lactams in moderate to good yields. The formation of the corresponding Z-isomers or five-membered products was not observed. The reaction of the readily available optically active propargylic amines provides a convenient synthesis of the corresponding (E)-alpha-chloroalkylidene-beta-lactams with high ee values. The structure and the stereochemistry of the products were established by the X-ray single-crystal diffraction study of (E)-6d and (E)-6e, which indicates that the stereoselectivity in this reaction is different from what was observed with propargylic alcohols. A rationale for this reaction was proposed.
Asymmetric synthesis via axially dissymmetric molecules. 7. Synthetic applications of the enantioselective reduction by binaphthol-modified lithium aluminum hydride reagents
作者:R. Noyori、I. Tomino、M. Yamada、M. Nishizawa
DOI:10.1021/ja00334a042
日期:1984.10
La reaction est applicable a une variete decomposescarbonyles insatures de structures diverses tels que, cetones aromatiques, cetones acetyleniques, cetones ethyleniques et aldehydes. L'utilite est illustree parla synthese fortement stereocontrolee d'intermediaires de prostaglandines, de quelques pheromones d'insectes, d'alcools terpeniques primaires chiraux, de phenyloxiranne optiquement actif
La 反应 est 适用一个 une variete de composes carbonyles insatures destructures different tels que, cetones aromatiques, cetones acetyleniques, cetones ethyleniques et aldehydes。L'utilite est illustree par la synthese fortement Stereocontrolee d'intermediaires de prostaglandines, de quelques pheromones d'insectes, d'alcools terpeniques primaires chiraux, de phenyloxiranne optiquement actif...
Kinetic Resolution of Propargylic Alcohols Catalyzed by Benzotetramisole
作者:Vladimir B. Birman、Lei Guo
DOI:10.1021/ol061906y
日期:2006.10.1
[reaction: see text] Kineticresolution of variously substituted secondary propargylic alcoholscatalyzed by benzotetramisole (BTM) proceeds with selectivity factors up to 32, the highest ever achieved with nonenzymatic catalysts for this class of substrates.
Highly enantioselective reduction of alkynyl ketones by a binaphthol-modified aluminum hydride reagent. Asymmetric synthesis of some insect pheromones
作者:M. Nishizawa、M. Yamada、R. Noyori
DOI:10.1016/0040-4039(81)80067-6
日期:1981.1
Alkynyl ketones can be reduced to chiral propargylic alcohols by a complex aluminumhydride modified by chiral 2,2′-dihydroxy-1,1′-binaphthyl. The synthetic utility has been demonstrated by the synthesis of the Japanese beetle and rove beetle pheromones.
The isomerization of optically-active propargyl alcohols to terminal acetylenes.
作者:M.Mark Midland、Ronald L. Halterman、Charles A. Brown、Angela Yamaichi
DOI:10.1016/s0040-4039(01)82095-5
日期:——
The isomerization of optically-active secondary propargyl alcohols, RCHOHCC(CH2)nCH3, to terminal acetylenicalcohols, RCHOH(CH2)n+1 C=CH, by potassium 3-aminopropylamide (KAPA) proceeds without loss of configuration at the hydroxy center.
Reductive cleavages of homochiral acetalsusing Lewis acid-hydride systems and of alkynyl acetalsusingorganoaluminumreagents are described. Stereochemical outcomes are found to be the opposite compared with our previous results on the aluminum hydride reduction of the acetal.