The syntheses of several unsaturated long-chain aminodiols of the sphingosine type are described. Their physical properties and biological activities are noted.
Reactivity of indole-3-alkoxides in the absence of acids: Rapid synthesis of homo-bisindolylmethanes
作者:Bhavani Shankar Chinta、Beeraiah Baire
DOI:10.1016/j.tet.2016.10.067
日期:2016.12
properties of the alkoxides offered the direct and selective construction of bisindolylmethanes and indole-3-carbinols. This process shows very broad scope and represents the reagent (external) free, greener synthesis of structurally divergent bisindolylmethanes.
1,2-Oxazol derivatives 3 were prepared by a highly regioselective 1,3-dipolar cycloaddition of nitrileoxides and α,β-acetylenicaldehydes 1 in good yields. Reactive nitrileoxides were generated in situ from stable chloro-oxime reagents 2 and triethyl amine. The cycloaddition reaction showed broad substrate scope and good functional group compatibility.
N-Heterocyclic Carbene Catalyzed Dynamic Kinetic Resolution of Pyranones
作者:Changgui Zhao、Fangyi Li、Jian Wang
DOI:10.1002/anie.201508205
日期:2016.1.26
The dynamickineticresolution of 6‐hydroxypyranones with enals or alkynals through an asymmetric redox esterification is catalyzed by a chiral N‐heterocyclic carbene. The resulting esters are obtained in good to high yields and with high levels of enantio‐ and diastereocontrol. The reaction products are further derivatized to obtain functionalized sugar derivatives and natural products.