A Three-Step Route to a Tricyclic Steroid Precursor.

[摘要]：2-Alkyl cyclohexenones are useful intermediates for org. synthesis. The Wittig reaction of a series of aldehydes with (cyclopropylmethyl)triphenylphosphonium bromide delivered the corresponding alkenyl cyclopropanes. UV irradn. in the presence of Fe(CO)5 converted the alkenyl cyclopropanes to the 2-substituted cyclohexenones. This approach enabled a three-step synthesis of the tricyclic core I of estrone Me ether.

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