作者:Teruaki Mukaiyama、Nobuharu Iwasawa、Rodney W. Stevens、Toru Haga
DOI:10.1016/s0040-4020(01)82423-6
日期:1984.1
A highly diastereoselective cross aldolreaction is developed using divalent tin enolates formed from stannous trifluoromethanesulfonate and carbonyl compounds. The reaction is extended to a highly enantioselective cross aldolreaction employing chiral diamines derivedfrom (S)-proline as ligands.
STANNOUS TRIFLATE: A NEW ALDOL REACTION VIA DIVALENT TIN ENOLATES
作者:Teruaki Mukaiyama、Rodney. W. Stevens、Nobuharu Iwasawa
DOI:10.1246/cl.1982.353
日期:1982.3.5
Divalent tin enolates formed from stannous triflate and ketones react with carbonyl compounds under mild conditions to give the corresponding aldol products in good yields. In the case of cross-cou...
A mild method for the diastereoselectiveMukaiyamaaldolreaction is reported. By using a lowloading of the gallium(III) triflatecatalyst (down to 0.01 mol-%), the transformation proceeds efficiently to afford the corresponding β-hydroxy ketones in yields up to 92 %. To the best of our knowledge, this is the first report of a metal triflate acting as a safe, bench-stable, and slow-releasing source
Stereoselective aldol condensations of organotin reagents with aldehydes
作者:Sharada S. Labadie、J.K. Stille
DOI:10.1016/0040-4020(84)80016-2
日期:1984.1
reaction requiring isomerization of the C-Sn to the O-Sn enolate. The Pd catalyzed condensation of cyanomethyltributyltin with reactive aldehydes, such as nitrobenzaldehydes, took place at ambient temperatures in polar solvents to give high yields of condensation products. No reaction occurred with aldehydes such as benzaldehyde. Only low stereoselectivity (10-34% ee) was observed when (-) DIOP or (-)BPPM
A NEW METHOD FOR THE REGIO- AND STEREOSELECTIVE SYNTHESIS OF ALDOLS FROM α-BROMOKETONE AND CARBONYL COMPOUNDS BY USING METALLIC TIN
作者:Taira Harada、Teruaki Mukaiyama
DOI:10.1246/cl.1982.467
日期:1982.4.5
Tin(II) enolates, generated in situ by the oxidative addition of α-bromoketones to metallic tin, react with a variety of carbonyl compounds under mild conditions to give the corresponding aldols in good yields. In the case of reactions of the enolate resulted from α-substituted α-bromoketone with aldehydes, remarkably high erythro-selectivities are attained.
锡 (II) 烯醇化物通过 α-溴酮与金属锡的氧化加成原位生成,在温和条件下与各种羰基化合物反应,以良好的收率得到相应的醛醇。在由 α-取代的 α-溴酮与醛产生的烯醇反应的情况下,获得了非常高的赤型选择性。