Remarkable Diastereoselectivity Eserted by Dienophile Configuration in Intramolecular Diels-Alder Reaction of Electron Deficient Heterodienes: New Chiral Entry into the Secoiridoid Monoterpenes and the Heteroyohibine Indole Alkaloids
Remarkable Diastereoselectivity Eserted by Dienophile Configuration in Intramolecular Diels-Alder Reaction of Electron Deficient Heterodienes: New Chiral Entry into the Secoiridoid Monoterpenes and the Heteroyohibine Indole Alkaloids
Aspects of the chemistry of dioxolanes: Synthesis of -nucleoside analogues
作者:Ben J. Mellor、Patricia E. Murray、Eric J. Thomas
DOI:10.1016/s0040-4020(97)10274-5
日期:1998.1
Chiral 2-formyl and 2-(1-oxoalkyl)-1,3-dioxolanes have been prepared by ozonolysis of the corresponding alkenes and by oxidation of 2-(1-hydroxyalkyl)-1,3-dioxolanes, which are readily available from 2-(tributylstannyl)dioxolanes, and taken through to αβ-unsaturated esters by condensation with stabilized ylids. The (4′S,5′S)-1-benzyl-5-[4,5-bis(ethoxycarbonyl)-1,3-dioxolan-2-yl]-2-pyridone 47 was prepared
Studies in Lewis acid and LiClO4 (or Nafion-H) catalysed ionic Diels-Alder reactions of chiral and achiral olefinic acetals respectively
作者:R Kumareswaran、Padma S Vankar、M Venkat Ram Reddy、Sangeeta V Pitre、Raja Roy、Yashwant D Vankar
DOI:10.1016/s0040-4020(98)01088-6
日期:1999.1
Chiral olefinic acetals derived from crotonaldehyde undergo ionicDiels-Alderreaction giving the corresponding cycloadducts in moderate to good diastereoselectivities. A variety of achiral olefinic acetals react with isoprene and cyclopentadiene to form the cycloadducts in good to excellent yields when catalysed by 4M LiClO4 in nitromethane or by Nafion-H in dichloromethane.