Sulfinimine-Mediated Asymmetric Synthesis of 1,3-Disubstituted Tetrahydroisoquinolines: A Stereoselective Synthesis of <i>cis</i>- and <i>trans</i>-6,8-Dimethoxy-1,3-dimethyl- 1,2,3,4-tetrahydroisoquinoline
作者:Franklin A. Davis、Pradyumna K. Mohanty、David M. Burns、Yemane W. Andemichael
DOI:10.1021/ol006654u
日期:2000.11.1
lithiated o-tolunitriles to sulfinimines followed by treatment of the resulting sulfinamide with MeLi, hydrolysis, and reduction represents a concise new methodology for the asymmetricsynthesis of 1,3-disubstituted tetrahydroisoquinolines.
Stereoselective addition to chiral p-toluene sulfinimines
作者:Wing Hong Chan、Albert W.M Lee、Ping Fang Xia、Wai Yeung Wong
DOI:10.1016/s0040-4039(00)00949-7
日期:2000.7
Diastereoselective addition of a number of Grignard reagents to chiral p-toluene sulfinimines 2b–2d under the mediation of copper salts afforded various protected α-branched amines.
Direct Asymmetric Synthesis of β-Amino Ketones from Sulfinimines (<i>N</i>-Sulfinylimines). Synthesis of (−)-Indolizidine 209B
作者:Franklin A. Davis、Bin Yang
DOI:10.1021/ol035981+
日期:2003.12.1
in one pot to protected amino ketones, which are valuable chiral building blocks for the assembly of piperidines. The utility of this methodology is illustrated in a concise asymmetric synthesis of (-)-indolizidine209B. [reaction: see text]
Asymmetric Aza-Henry Reactions from <i>N</i>-<i>p</i>-Tolylsulfinylimines
作者:José Luis García Ruano、Markus Topp、Jesús López-Cantarero、José Alemán、Modesto J. Remuiñán、M. Belén Cid
DOI:10.1021/ol051580d
日期:2005.9.1
[reaction: see text] N-Sulfinylimines derived from aromatic or aliphatic aldehydes and ketones react with nitromethane and NaOH in a highly diastereoselective manner under mild conditions. In the presence of TBAF, the reaction rates are strongly increased and the stereoselectivity is inverted. This method provides enantiomerically pure beta-nitroamines derived from enolizable aldimines and ketimines
Highly Diastereoselective [3+2] Cycloadditions between Nonracemic p-Tolylsulfinimines and Iminoesters: An Efficient Entry to Enantiopure Imidazolidines and Vicinal Diaminoalcohols
作者:Alma Viso、Roberto Fernández de la Pradilla、Ana García、Carlos Guerrero-Strachan、Marta Alonso、Mariola Tortosa、Aida Flores、Martín Martínez-Ripoll、Isabel Fonseca、Isabelle André、Ana Rodríguez
DOI:10.1002/chem.200204674
日期:2003.6.16
highly diastereoselective process with opposite stereochemistry. Subsequent transformations of the imidazolidines including oxidative, reductive, and hydrolytic processes that provide easy access to vicinal diaminoalcohols have been explored. Among these, reductive cleavage of the aminal with LiAlH4 is an extremely efficient and general reaction for the synthesis of enantiopure N-sulfinyl-N'-benzyldiaminoalcohols