摘要:
Asymmetric oxidation of verbenone ethylene dithioacetal with m-chloroperoxybenzoic acid at different substrate-to-oxidant ratios in methylene chloride at -10A degrees C gave previously unknown (1S,1'S,2S,3'S,5S)-4,6,6-trimethylspiro[bicyclo[3.1.1]hept-3-ene-2,2'-[1,3]dithiolane] 1',3'-dioxide, (1S,2S,3'S,5S)-4,6,6-trimethylspiro[bicyclo[3.1.1]hept-3-ene-2,2'-[1,3]dithiolane] 1',1',3'-trioxide, and (1S,5S)-4,6,6-trimethylspiro[bicyclo-[3.1.1]hept-3-ene-2,2'-[1,3]dithiolane] 1',1',3',3'-tetraoxide whose structure was determined by X-ray analysis.