An efficient and stereoselective syntheses of all the possible stereoisomers of coronafacic acid (CFA) has been developed. The stereochemistries of C3a and C7a were controlled in a diastereoselective Diels‐Alder type cycloaddition using a chiral auxiliary. CFA and 6‐epi‐CFA were synthesized by hydrogenation of a common intermediate. During the synthesis of 6‐epi‐CFA, we established that its cis‐fused
Catalytic Asymmetric Desymmetrization of Cyclopentendiones via Diels–Alder Reaction of 3-Hydroxy-2-pyrones: Construction of Multifunctional Bridged Tricyclic Lactones
作者:Li-Min Shi、Wu-Wei Dong、Hai-Yan Tao、Xiu-Qin Dong、Chun-Jiang Wang
DOI:10.1021/acs.orglett.7b02107
日期:2017.9.1
An unprecedented asymmetricDiels–Alderreaction of 3-hydroxy-2-pyrones with prochiral cyclopentene-1,3-diones via desymmetrization was efficiently realized with high stereoselective control with the aid of fine-tunable cinchona alkaloid derived bifunctional amine–thiourea catalysts bearing multiple hydrogen-bonding donors. This protocol provides an expedient access to the multifunctional-bridged tricyclic
syntheses of four stereoisomers of coronatine employing the exo-selectiveDiels–Alder reaction as a key step. Remarkable differences in stomatal opening activity were observed between enantiomers of coronatine. This result strongly suggests that the stereo structure of coronatine is very important for its stomatal opening activity. In addition, SAR studies suggested that coronatine operates as a molecular
Azido-Coronatine: A Useful Platform for “Click Chemistry”-Mediated Probe Synthesis for Bioorganic Studies
作者:Masahiro OKADA、Syuusuke EGOSHI、Minoru UEDA
DOI:10.1271/bbb.100518
日期:2010.10.23
azide-coronatine as a useful platform for azide alkyne cycloaddition ("click chemistry")-mediated synthesis of molecular probes. (+)-Azido-coronatine was synthesized in 10 steps with 11% yield using improved synthesis of coronafacic acid, in which the highly exo-selectiveDiels-Alderreaction (endo:exo > 1:25) is the key step. Azido coronatine was as effective as the original coronatine in a stomatal