Highly Stereoselective Ene Reaction of Aldimines with 2-(Alkylthio)allyl Silyl Ethers
作者:Yoshitomo Tohyama、Keiji Tanino、Isao Kuwajima
DOI:10.1021/jo00082a004
日期:1994.2
A stereoselective ene reaction of aldimines with 2-(alkylthio)allyl silyl ethers was developed. Under the influence of Lewis acids, N-acylimine or geminal biscarbamates reacted with a (Z)-2-(methylthio)allyl silyl ether to afford syn adducts in >94% selectivity.
KROW, G. R.;HENZ, K. J.;SZCZEPANSKI, S. W., J. ORG. CHEM., 1985, 50, N 11, 1888-1894
作者:KROW, G. R.、HENZ, K. J.、SZCZEPANSKI, S. W.
DOI:——
日期:——
Heterodienophiles. 10. Stereoselectivity in the 1,4-cycloaddition of N-(ethoxycarbonyl)-C-alkylaldiminium ions with 1,3-cyclohexadiene
作者:Grant R. Krow、Kenneth J. Henz、Steven W. Szczepanski
DOI:10.1021/jo00211a021
日期:1985.5
Synthesis of β-amino-α,α-difluoroketones by reactions of 1,1-difluorovinyl methyl ethers with N-acyliminium intermediates
An efficient preparation of β-amino-α,α-difluoroketones 4 was developed. Reactions of 1,1-difluorovinylmethylethers 1 with N-acyliminiumintermediates, generated by treating biscarbamates 2 with trifluoromethanesulfonic anhydride (Tf2O) in the presence of molecular sieves 4A (MS 4A), provided 4 in good yields.