Development of a C–C Bond Cleavage/Vinylation/Mizoroki–Heck Cascade Reaction: Application to the Total Synthesis of 14- and 15-Hydroxypatchoulol
作者:Christina G. Na、Suh Hyun Kang、Richmond Sarpong
DOI:10.1021/jacs.2c09201
日期:2022.10.26
A C–C bond cleavage/vinylation/Mizoroki–Heck cascadereaction has been developed to provide access to densely functionalized bicyclo[2.2.2]octane frameworks. The sequence proceeds through the coupling of dihydroxylated pinene derivatives, prepared from carvone, with gem-dichloroalkenes. The method was applied to 12-step total syntheses of both 14- and 15-hydroxypatchoulol, which provided unambiguous
The olefination of ketones using the organotitanium species formed from Cp2Ti[P(OEt)(3)](2) and polychloromethane was studied. The reaction of the organotitanium species prepared from carbon tetrachloride with ketones produced the 1,1-dichloro-1-alkenes in good yields even when dialkyl ketones were employed. The similar olefination of ketones using chloroform afforded the 1-chloro-1-alkenes and 1,1-dichloro-1-alkenes, the ratio of which reflected the steric demand on the ketones. The titanocene chloromethylidene complex was suggested to be an active species of the reaction on the basis of the results obtained by the reaction using chloroform-d. (C) 1999 Elsevier Science Ltd. All rights reserved.
Stereoelectronic effects: Perlin effects in cyclohexane‐derived compounds
作者:Sebastian T. Jung、Roman Nickisch、Tony Reinsperger、Burkhard Luy、Joachim Podlech
DOI:10.1002/poc.4165
日期:2021.4
Stereoelectroniceffects in cyclohexanones, methylenecyclohexanes, spiro, and epoxy compounds of cyclohexanes and further derivatives were investigated by measuring 1JC,H coupling constants and by identification of Perlin effects, that is, of differences in the coupling constants for equatorial and axial CH bonds in the methylene groups of six‐membered rings. The Perlin effects were correlated with