Experimental studies of the anomeric effect. part III. Rotameric preferences about the exo-cyclic c2-x bond in equatorial and axial 2-methoxy- and 2-methylamino-tetrahydropyrans.
Experimental studies of the anomeric effect. part III. Rotameric preferences about the exo-cyclic c2-x bond in equatorial and axial 2-methoxy- and 2-methylamino-tetrahydropyrans.
Studies towards diarylheptanoid synthesis. Part 2: Synthesis and ring cleavage reactions of tetrahydro-4H-furo[2,3-b]pyran-2-ones
作者:Sidika Polat Cakir、Keith T. Mead、Laura T. Smith
DOI:10.1016/s0040-4039(03)01421-7
日期:2003.8
Lewis acid promoted anomeric substitution reactions of a series of tetrahydro-4H-furo[2,3-b]pyran-2-one derivatives were studied as a model for diarylheptanoid synthesis.
研究了路易斯酸促进的一系列四氢-4 H-呋喃并[2,3 - b ]吡喃-2-酮衍生物的异头取代反应,作为二芳基庚烷合成的模型。
Reactions of <b><i>N</i></b>-Acyl Imines with Dihydropyrans
作者:Keith Mead、Sidika Cakir
DOI:10.1055/s-2008-1032209
日期:2008.3
A series of dihydropyranyl acetamides was synthesized by the TFA-catalyzed reaction of dihydropyrans with N-acyl imines.
通过二氢吡喃与N-酰基亚胺的TFA催化反应合成了一系列二氢吡喃基乙酰胺。
Catalytic Enantioselective [4+2] Cycloadditions of Salicylaldehyde Acetals with Enol Ethers
作者:Xiaojun Hu、Zhengbo Zhu、Zhongzheng Li、Alafate Adili、Minami Odagi、Khalil A. Abboud、Daniel Seidel
DOI:10.1002/anie.202315759
日期:2024.1.22
A readily accessible conjugate-base-stabilized carboxylic acid (CBSCA) catalyst facilitates highly enantioselective [4+2] cycloaddition reactions of salicylaldehyde-derived acetals and cyclic enol ethers, resulting in the formation of polycyclic chromanes with oxygenation in the 2- and 4-positions. Spirocyclic products are also accessible.
Experimental studies of the anomeric effect. part III. Rotameric preferences about the exo-cyclic c2-x bond in equatorial and axial 2-methoxy- and 2-methylamino-tetrahydropyrans.
作者:Harold Booth、J. Mark Dixon、Khedhair A. Khedhair、Simon A. Readshaw