Abstract
Abstract Photochemically generated singlet oxygen adds selectively to C20–C22 rather than C5–C6 double bond of pseudodiosgenin diacetate 1 to give diosone 4, an important intermediate for preparation of many steroidal drugs, and ene product 3 at room temperature. 3 was separated and characterized by 1H and 13C NMR as well as IR. When pyridine and acetic anhydride were presented, the Criegee rearrangement of 3 can yield 4, as a result, leading to a high collection yield (80% in acetonitrile) of 4.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.