Zobrazeno 1 - 4
of 4
pro vyhledávání: '"Sibaprasad Sahoo"'
Publikováno v:
Tetrahedron. 74:68-76
A modification is proposed in Kagan's amide in order to improve its ability to offer stronger hydrogen bonding and hence better ability to bind with substrates. Introduction of chlorine in the amide aromatic ring along with the two nitro groups, incr
Publikováno v:
Tetrahedron: Asymmetry. 27:777-781
The preparation of the (−)-menthyl carbonate of 2-hydroxy-7-oxa[5]helicene and its structural characterization is reported. Single crystal X-ray diffraction analysis established the relatively flat structure of oxa[5]helicene unit thus indicating t
Publikováno v:
Tetrahedron Letters. 55:5394-5399
Synthesis of four derivatives of symmetrical aza[7]helicenes is achieved by I2-THF mediated photocyclization of corresponding bis-styryl derivatives. The cyclization furnished the desired angularly fused aza-helicene in moderate yields. The structure
Publikováno v:
Organic Letters. 14:3166-3169
A series of novel 1,3-oxazines were prepared to construct a helical framework. The 1,3-oxazine attached to the phenanthrene unit showed a small bite angle θ (∼12°), while the units attached to [4]helicene showed a larger θ (∼35°) and exhibite