Utility of a chiral 1,3-dioxane template in stereoselective intramolecular Diels–Alder reactions
摘要:
The ethylidene acetal Of D-erythrose was used as a template for stereoselective IMDA reactions: high endo selectivity and yields in favor of the cis product were observed with 1,3,9-trienes, resulting from a boat transition state. For natural product synthesis, the reaction was successfully applied to a diene with terminal Z-olefin. (c) 2007 Elsevier Ltd. All rights reserved.
asymmetric 1,3-dioxane template in intramolecularDiels-Alder reactions is reported. The 1,3,9-decatrienoates substrates gave predominantly the endo-boat products, with minor amounts of the exo-boat isomer. Various substitutions (14 examples) were introduced and the results gave an indication of the scope and also a few limitations of the method. In particular, the approach was applicable to (E,Z)-diene