Studies on the constituents of asclepiadaceae plants. XXXVI. Component of Marsdenia tomentosa Decne: Structure of tomentonin, tomentodin and dehydrotomentosin and difference in the reactivity between utendin and tomentogenin diesters on mild alkaline hydrolysis.
Seto,H. et al., Chemical and pharmaceutical bulletin, 1976, vol. 24, p. 2185 - 2190
作者:Seto,H. et al.
DOI:——
日期:——
Scalable C–H Oxidation with Copper: Synthesis of Polyoxypregnanes
作者:Yi Yang See、Aaron T. Herrmann、Yoshinori Aihara、Phil S. Baran
DOI:10.1021/jacs.5b09463
日期:2015.11.4
Steroids bearing C12 oxidations are widespread in nature, yet only one preparative chemical method addresses this challenge in a low-yielding and not fully understood fashion: Schonecker's Cu-mediated oxidation. This work shines new light onto this powerful C-H oxidation method through mechanistic investigation, optimization, and wider application. Culminating in a scalable, rapid, high-yielding, and operationally simple protocol, this procedure is applied to the first synthesis of several parent polyoxypregnane natural products, representing a gateway to over 100 family members.