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 FACILE CROSS-ALDOL REACTION BETWEEN TWO KETONES VIA DIVALENT TIN ENOLATES
作者:Rodney W. Stevens、Nobuharu Iwasawa、Teruaki Mukaiyama
DOI:10.1246/cl.1982.1459
日期:1982.9.5
Divalent tinenolates, formed from stannous triflate and ketones, react with a second ketone under mild conditions to afford the corresponding cross-aldol products in good to excellent yields. In the case of the cross-coupling with aromatic ketone, enhanced threo-selectivity was observed.
three-component coupling reaction between vinyl ketones, aldehydes, and halides has been developed with TiCl(4)-n-Bu(4)NX combined reagents. Treatment of vinyl ketones with a TiCl(4)-n-Bu(4)NI combination followed by an addition of a variety of aldehydes provides syn-alpha-iodomethyl-beta-hydroxy ketones with high stereoselectivity. Methyltriphenylphosphonium iodide as well as n-Bu(4)NI acts efficiently
Cerium enolates formed from cerium (III) chloride and lithium enolates undergo aldolreaction with ketones or sterically crowded aldehydes to afford the corresponding β-hydroxyketones in high yields.
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。