将二乙基硫代二氟甲基膦酸酯加到对映体纯的芳族,杂芳族和脂族醛衍生的亚磺酸亚胺中,得到的N-亚磺酰基α,α-二氟-β-氨基膦酸酯通常具有良好的对映选择性,并且产率很高。与苯乙酮衍生的亚磺胺的反应导致形成具有高非对映选择性且仅中等收率的加成产物。两步脱保护,包括在EtOH中用三氟乙酸处理非对映体纯的N-亚磺酰基α,α-二氟-β-氨基膦酸酯,然后与10 N HCl回流,得到对映体纯的α,α-二氟-β-氨基膦酸酯和α,α-二氟-β-氨基膦酸。(R的N -Cbz导数)-2-氨基-1,1-二氟-2-苯基乙基膦酸酯是制备相应的二氟膦酸酯单酯,二氟膦酸和二氟膦酰胺酸的方便起点。在21°C下,二氟膦酰胺酸在pH高于5的水溶液中稳定。
Asymmetric synthesis of chiral sulfoxides and sulfinimines by using N-sulfinylsultam
摘要:
Bornane-10,2-sultam 1 is stereoselectively converted by DMAP-assisted sulfinylation to diastereomerically pure (2R)-N-[(R)-p-tolylsulfinyl]-bornane-10,2-sultam 2 in 77% yield. The crystalline sulfinylating agent 2 reacts with a variety of nucleophiles to afford sulfoxides 3 and sulfinimines 5 in excellent yields and enantioselectivities. (C) 1997 Elsevier Science Ltd.
Two oxathiozolidine‐S‐oxide templates have been developed and used in a four‐component coupling protocol for the synthesis of a wide range of chiralsulfinimines in high enantiomeric excesses. The templates can be synthesized from cheap commodity chemicals in three steps in high yields. Furthermore the template is easily recovered in high yields for recycling.
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 aziridination by reaction of chiral N-sulfinylimines with sulfur ylides: Stereoselectivity improvement by use of tert-butylsulfinyl group as chiral auxiliary
作者:JoséL García Ruano、Inmaculada Fernández、Miriam del Prado Catalina、Ana Alcudia Cruz
DOI:10.1016/s0957-4166(96)00448-x
日期:1996.12
Chiraltert-butylsulfinylgroup has been shown to be the chiralauxiliary of choice for the asymmetric aziridination of N-sulfinyliminas. Moreover, the sense of the asymmetric induction can be tuned in two ways: the chirality at the tert-butylsulfinyl Sulfur, or the nature of the methylene transfer reagent used. Thus, both aziridines 10(Ss,S) and 10(Rs,R), epimeric at C-2, were obtained in enantiomerically