The First Efficient Asymmetric Synthesis of 7-0xabicyclo[2.2.l]hept-5-ene-2- car boxylate Derivatives ... Hiromitsu Takayama, Akira lyobe, and Toru Koizumi" Faculty of Pharmaceutical Sciences, To yama Medical & Pharmaceutical University, Sugitani 2630, To yama 930-0 1, Japan ... The asymmetic synthesis of 7-oxabicyclo[2.2.l]hept-5-ene-2-carboxylate ... 7-endo-Oxabicyclo[2.2 .l]hept-5-ene-2-carboxylic acid (1) and its derivatives are useful intermediates in the ...