Stereoelectronic versus Steric Tuning in the Prins Cyclization Reaction: Synthesis of 2,6-trans Pyranyl Motifs
摘要:
The use of carboalkoxyl allenic alcohol for the efficient synthesis of pyranyl motifs via Prins cyclization is described. This method provides easy access to 2,6-trans dihydropyrans in good yield and high diastereoselectivity.
Highly stereocontrolled synthesis of fluorinated 2,6-trans dihydropyrans via Prins cyclization
摘要:
A highly efficient method for the synthesis of fluorinated 2,6-trans dihydropyrans via BF3 center dot Et2O-promoted Prins cyclization of allenic alcohols and aldehydes is developed. Various 2,6-trans fluorodihydropyrans are obtained in moderate to good yields with excellent diastereoselectivities. (C) 2010 Elsevier Ltd. All rights reserved.