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Mibolerone
Mibolerone is a potent anabolic steroid which is both higher affinity and more selective for the androgen receptor than metribolone.
Under the brand name "Cheque Drops", Mibolerone was marketed as a veterinary drug by the Upjohn company. It was indicated as an oral treatment for estrous (heat) prevention in adult female dogs.
==Synthesis==
Nandrolone (1) appears to be used to make Mibolerone. For comparison, also see bolasterone and calusterone. The first step involves extending the conjugation of the enone function by an additional double bond. Chloranil (tetrachloroquinone) is the forerunner of dichlorodicyanoquinone (DDQ), a reagent used extensively for introducing additional unsaturation in the progestin and corticoid series.
In the case at hand, heating acetate (1) with chloranil gives the conjugated dieneone (2), and reaction of that compound with methylmagnesium bromide in the presence of cuprous chloride leads to addition of the methyl group to position 7 at the end of the conjugated system (3). The stereochemistry of the product again illustrates the preference for additions from the backside. The alcohol at C17 is then oxidized to a ketone (4). Enamines are commonly used to activate adjacent functions; they are also not infrequently used, as in this case, as protecting groups. Thus, reaction of the intermediate with pyrrolidine gives dienamine (5). This transformation emphasizes the clear difference in reactivity between ketones at C7 and C17. A second methyl Grignard addition gives the corresponding 17α-methyl derivative. Hydrolysis of the enamine function then affords mibolerone (6).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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