Epimeric 2,3-epoxy brassinosteroids

Mass spectral fragmentation of methaneboronates of the epimeric 2,3-epoxy brassinosteroids 32, 38-40 and the 3,6-diketo brassinosteroids 31 and 41... 

Synthesis of secasterone and further epimeric 2,3-epoxy brassinosteroids... 

The structural determination of endogenous brassinosteroids, present only in minute amounts in plant material, requires the availability of corresponding reference standards. Thus, for the final identification of the new brassinosteroid secasterone (32) isolated from Secale cereale (see, Section 2), the four epimeric brassinosteroids with 2,3-epoxy function derived from castasterone (3) and 24-epicastasterone (13), respectively, were synthesized (Scheme 6).69... 

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See also in sourсe #XX -- [ ]

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