2-Haloethynyl-2-norbomanols react with iodine and Koser's reagent in acetonitrile to afford two ring-expanded products, 2-[(Z)-haloiodomethylidene]bicyclo[3.2.1]octan-3-one and 3-[(Z)-haloiodomethylidene]bicyclo[3.2.1]octan-2-one. These results contrast with the 2-haloethynyl-2-bomanols which lead to the corresponding 3-octanones.
2-Haloethynyl-2-norbomanols react with iodine and Koser's reagent in acetonitrile to afford two ring-expanded products, 2-[(Z)-haloiodomethylidene]bicyclo[3.2.1]octan-3-one and 3-[(Z)-haloiodomethylidene]bicyclo[3.2.1]octan-2-one. These results contrast with the 2-haloethynyl-2-bomanols which lead to the corresponding 3-octanones.
Ring expansion of an α-bromoalkynol camphor by means of iodine and Koser's reagent
作者:Pakorn Bovonsombat、Edward McNelis
DOI:10.1016/s0040-4039(00)79328-2
日期:1993.7
The bromoethynyl adduct of camphor was treated with equimolar amounts of iodine and Koser's reagent (HTIB) to afford in good yield and in good stereospecificity a (Z)-bromoiodoenone, a synthon for enantiospecific syntheses.