Oxidant controlled regio- and stereodivergent azidohydroxylation of alkenes via I<sub>2</sub> catalysis
作者:P. K. Prasad、R. N. Reddi、A. Sudalai
DOI:10.1039/c5cc02374b
日期:——
A novel, I2 catalyzed regio- and stereodivergent vicinal azidohydroxylation of alkenes leading to 1,2-azidoalcohols in high yields (up to 92%) and excellent dr (up to 98%) has been developed.
An Epoxide Ring-Opening Reaction via Hypervalent Silicate Intermediate: Synthesis of Statine
作者:Hiroyuki Konno、Emi Toshiro、Naoyuki Hinoda
DOI:10.1055/s-2003-41049
日期:——
cyanide-opening reaction of epoxide with TBAF and TMSN, in THF or TBAF and TMSCN in MeCN occurred regioselectively to afford β-hydroxy azides and cyanides in good yield. These hypervalentsilicates have been shown to be highly effective as nucleophilic azide and cyanide donors under mild conditions. This methodology has been applied to the preparation of statine.
A practical route to enantiopure 1,2-aminoalcohols
作者:Han-Ting Chang、K.Barry Sharpless
DOI:10.1016/0040-4039(96)00534-5
日期:1996.5
A series of enantiopure aminoalcohols were synthesized from the corresponding diols by activation of the diols as cyclic carbonates, azide opening of the carbonates, and hydrogenation of the resulting azidoalcohols. Factors affecting the azide opening of the carbonates, a simple workup procedure, and a large scale synthesis of (1R,2S)-(−)-2-amino-1,2-diphenylethanol are described.
Synthesis of three cis-trans pairs of N-sulfonylated-2-aziridinemethanols starting from (S)-threonine, (R)-allothreonine, a chiral 2-amino alcohol, or enantiomerically enriched 2, 3-epoxy alcohols is described. A synthetic route to N-tosyl- and N-mesyl-2-aziridinemethanols from (R)- and (S)-serines is also presented.