Unexpected selectivity between pinacolic rearrangement and intramolecular displacement in the acid-promoted epoxide ring opening of 6-exo-cyano-3,8-dioxabicyclo[3.2.1.02,4]oct-6-endo-yl esters
作者:Suzy Allemann、Pierre Vogel
DOI:10.1016/s0040-4020(01)86963-5
日期:1994.2
Acid promoted epoxideringopening of 2-exo-cyano-5-exo,6-exo-epoxy-7-oxabicyclo[2.2.1]hept-2-endo-yl acetate is accompanied by a Wagner-Meerwein (pinacolic) rearrangement when run in CH2Cl2/HSO3F and by endo acetoxy group participation when run in CF3CH(OH)CF3/HCIO4. An efficient and stereoselective trans-double hydroxylation of centers C(5) and C(6) of the “naked sugar” (1R,2S,4R)-2-exo-cyano-7-oxabicyclo[2