addition to enantiomerically enriched (tert-butyl)- and (para-tolyl)sulfinimines. This new in situ protocol produces two new CC bonds. Chiral allylic sulfinamides are obtained in high diastereoselectivity and in good yield. Cleavage of the chiral auxiliary leads to synthetically useful allylic amine building blocks, and facile oxidative degradation of the alkene moiety can be used as an approach toward
在催化性 Cp2ZrCl2 和 H2O 存在下,炔烃的碳铝化得到乙烯基丙烷中间体,其在随后添加到对映体富集的(叔丁基)和(对甲苯基)亚磺酰亚胺中充当亲核试剂。这种新的原位协议产生了两个新的 CC 债券。以高非对映选择性和良好收率获得手性烯丙基亚磺酰胺。手性助剂的裂解导致合成有用的烯丙胺结构单元,烯烃部分的易氧化降解可用作获得氨基酸衍生物和分配绝对构型的方法。
Asymmetric synthesis of sulfinimines: Chiral ammonia imine synthons
作者:Franklin A. Davis、Rajarathnam E. Reddy、Joanna M. Szewczyk、Padma S. Portonovo
DOI:10.1016/s0040-4039(00)73717-8
日期:1993.9
Two Andersen-type procedures for the preparation of enantiopure sulfinimines 1 (R=H) in better than 95% ee from nitriles and aldehydes are described.
Highly Diastereoselective Addition of the Lithium Enolate of α-Diazoacetoacetate to <i>N</i>-Sulfinyl Imines: Enantioselective Synthesis of 2-Oxo and 3-Oxo Pyrrolidines
作者:Changqing Dong、Fanyang Mo、Jianbo Wang
DOI:10.1021/jo702275a
日期:2008.3.1
The highly enantioselective synthesis of 2-oxo and 3-oxo pyrrolidines has been achieved by diastereoselective addition of the lithiumenolate of α-diazoacetoacetate to chiral N-sulfinyl imines, followed by photoinduced Wolff rearrangement or Rh(II)-catalyzed intramolecular N−H insertion.
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