名称:
Epoxidation of Four Possible Conformers of Humulene 9,10-Epoxide: First Isolation of 2R*, 3R*, 6S*, 7S*, 9S*, 10S*-Humulene 2,3;6,7;9,10-Triepoxide
摘要:
The complete reaction of humulene 9,10-epoxide ((2E, 6E)-9,10-epoxy-3,7,11,11-tetramethylcycloundeca-2,6-diene, (1)) with m-CPBA produced a hitherto unknown 2R*, 3R*, 6S*, 7S*, 9S*, 10S*-2,3;6,7;9,10-triepoxy-3,7,11,11-tetramethylcycloundecane (6) together with three known humulene triepoxides (7, 8 and 9), in the ratio of 6 : 7 : 8 : 9 = 1.3 : 11.5 : 22.6 : 64.6. The configuration of 6 was determined by X-Ray crystallography (C15H24O3: space group P2(1)/n with a=14.147(4)Angstrom, b = 8.419(3) Angstrom, c = 12.238(4)Angstrom, beta = 102.10(3)degrees, Z = 4). The new triepoxide (6) maintained configuration corresponding to the TT conformer, one of the four possible conformers of 1.