A simple and efficient procedure was developed for the preparation of a variety of aryl, hetero aryl and alkyl N-sulfinylimines (2b-2u) with excellent yields (85–94%) using tungstophosphoric acid as catalyst. Also, this new synthetic protocol features high conversion, shorter reaction time, a straight forward and simple work up procedure. Catalyst was recycled for 10 times without much loss in activity
Triisopropyl borate mediated N -sulfinyl imine formation
作者:Michael D. Visco、Jonathan T. Reeves、Maurice A. Marsini、Ivan Volchkov、Carl A. Busacca、Anita E. Mattson、Chris H. Senanayake
DOI:10.1016/j.tetlet.2016.03.063
日期:2016.4
Triisopropyl borate effects the condensation of aldehydes with sulfinamides to give N-sulfinyl imines. The reaction is amenable to 1°, 2°, and 3° alkyl aldehydes, as well as aryl, heteroaryl, and α,β-unsaturated aldehydes. In addition to tert-butanesulfinamide, the condensation is also effective with 4-toluenesulfinamide and 2,4,6-triisopropylphenylsulfinamide. This protocol proceeds under homogeneous
KHSO<sub>4</sub>-Mediated Condensation Reactions of <i>tert</i>-Butanesulfinamide with Aldehydes. Preparation of <i>tert</i>-Butanesulfinyl Aldimines
作者:Yong Qin、Zhiyan Huang、Min Zhang、Yin Wang
DOI:10.1055/s-2005-865234
日期:——
tert-butanesulfinyl aldimines 1 were prepared by direct condensation of chiral tert-butanesulfinamide 3 with aldehydes 2 in high yields in the presence of KHSO 4 . The main advantage of KHSO 4 is that it is applicable to the condensation reactions of a variety of aldehydes, including electron deficient and electron rich (hetereo)aromatic aldehydes, as well as aliphatic aldehydes.
A New and Convenient Asymmetric Synthesis of α-Amino- and α-Alkyl-α-aminophosphonic Acids Using <i>N</i>-<i>tert</i>-Butylsulfinyl Imines as Chiral Auxiliaries
作者:Chengye Yuan、Qianyi Chen
DOI:10.1055/s-2007-990872
日期:2007.12
successfully at room temperature with potassium carbonate as base to afford α-amino- and α-alkyl-α-amino- N-( TERT-butylsulfinyl)phosphonates in good to excellent chemical yield and diastereoselectivity. The major diastereo-mers were separated and smoothly converted into enantiopure α-amino- and α-alkyl-α-aminophosphonic acids.
Auxiliary strategies for the preparation of β-amino alcohols with reductive cross-coupling and a synthesis of (−)-cytoxazone
作者:Xiangjie Lin、Paul A. Bentley、Hexin Xie
DOI:10.1016/j.tetlet.2005.09.002
日期:2005.11
Imine auxiliaries including chiral N-tert-butanesulfinyl imines have been successfully utilized to provide stereochemical control to the reductive cross-coupling of imines with aldehydes or ketones. This methodology has been applied to the synthesis of (−)-cytoxazone.