Stereocontrolled Synthesis of 13-Substituted Retinoic Acids by Palladium-Catalyzed Coupling Reaction of Alkenyl Stannane with Vinyl Triflate
作者:Akimori Wada、Kouki Fukunaga、Masayoshi Ito
DOI:10.1055/s-2001-14908
日期:——
A novel method for the stereoselective synthesis of all-E-, 13Z- and 9Z-retionic acid esters was developed by palladium-catalyzed cross coupling reactions of tetraenyl stannanes with E- or Z-vinyl triflates in good yields. Applying this methodology, 13-substituted all-E- and 9Z-retionic acids were prepared in satisfactory yields.
Stereoselective Synthesis of Acetoacetate-Derived Enol Triflates
作者:David Babinski、Omid Soltani、Doug E. Frantz
DOI:10.1021/ol8010002
日期:2008.7.3
A highly stereoselective method for preparing ( Z)- and ( E)-enol triflates derived from substituted acetoacetate derivatives is described. The salient feature of this methodology is the use of Schotten-Baumann-type conditions to control enolate geometry using either aqueous LiOH ( Z-selective) or aqueous (Me)(4)NOH ( E-selective) in combination with triflic anhydride to provide a practical and predictable
Unified Approach to Substituted Allenoates via Pd-Catalyzed β-Hydride Elimination of (<i>E</i>)-Enol Triflates
作者:Marie El Arba、Sara E. Dibrell、Ian T. Crouch、Doug E. Frantz
DOI:10.1021/acs.orglett.7b02736
日期:2017.10.6
A robust synthesis of allenoates via a Pd-catalyzed beta-hydride elimination of (E)-enol triflates is presented. Salient features of this method include low catalyst loadings, mild reaction conditions, and the ability to access all four patterns of substituted allenoates from a single substrate class.
Preparation and biological activity of 13-substituted retinoic acids
13-Demethyl or 13-substituted all-E- and 9Z-retinoic acids were synthesized using a palladium-catalyzed coupling reaction of enol triflates and tributylstannylolefins. Their biological activities were then measured. The 13-ethyl analogs exhibited approximately one-half of the antiproliferative and differentiation-inducing activity of ATRA in HL-60 cells. In contrast, in the 9Z-derivatives, all analogs, except for the 13-butyl derivatives, showed apoptosis-inducing activity. (C) 2004 Elsevier Ltd. All rights reserved.
YAMAMOTO, MAKOTO;URUMA, TAKASHI;KOHMOTO, SHIGEO;YAMADA, KAZUTOSHI, NIPPON KAGAKU KAJSI,(1989) N, S. 760-763