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- W1988663809 abstract "Catalytic β-stereoselective epoxidation of Δ5-unsaturated steroid derivatives has been effected by a novel ruthenium(II) bioxazoline complex under aerobic conditions. The reactions are regio- and stereoselective. The reaction conditions provide the corresponding 5β,6β-epoxides with high degree of stereoselectivity (88−96%) in very good yields, while oxidation of steroid derivatives with peracids leads to 5α,6α-epoxides as the major products. The overall conformation of the steroid nucleus is nearly planar in the cholesteryl ester, while it is bent at the junction between the rings A and B in the 5β,6β-epoxide. This change from pseudo-trans- to cis-stereochemistry of the A−B ring junction provides more room for the catalyst to approach from the β-face of the steroidal skeleton." @default.
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- W1988663809 date "1998-09-16" @default.
- W1988663809 modified "2023-09-28" @default.
- W1988663809 title "A Highly β-Stereoselective Catalytic Epoxidation of Δ<sup>5</sup>-Unsaturated Steroids with a Novel Ruthenium(II) Complex under Aerobic Conditions" @default.
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- W1988663809 doi "https://doi.org/10.1021/jo980829k" @default.
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