Synthesis and Crystal Structure of Decahydro-dispiro[oxirane-2,3'-(2'H)benzofuran-2',2''-[2H]pyran]

2'S*,3'R*,3'aS~,7'aR*)-Decahydro-dispiro[oxirane-2,3' (Zag) benzofuran-2'.2' '-[2sl pyranl (5-6) and its isomer E-6' with epimeric stereochemistry of the epo...