A Facile and Mild Method for the Synthesis of Terminal Bromofluoroolefins via Diethylzinc-Promoted Wittig Reaction
摘要:
Synthesis of 1-bromo-1-fluoroolefins was achieved in good yields via a Wittig reaction promoted by diethylzinc, even with nonactivated aldehydes and ketones as starting materials.
A Simple, Two-Step, Site-Specific Preparation of Fluorinated Naphthalene and Phenanthrene Derivatives from Fluorobromo-Substituted Alkenes
作者:Yi Wang、Jianjun Xu、Donald J. Burton
DOI:10.1021/jo061305k
日期:2006.9.1
two-step procedure for the site-specific preparation of fluorinated naphthalene and phenanthrenederivatives is described. The Sonogashira reaction of bromofluoro-substituted alkenes with terminal alkynes, followed by base-catalyzed cyclization in refluxing N-methyl-2-pyrrolidinone (NMP), affords the corresponding fluorinated naphthalene and phenanthrenederivatives in good yields.
The reactions of fluorinated ylide, generated from tris(dimethylamino)phosphine and tribromofluoromethane, with simple aldehydes and reactive ketones gave the expected Wittig reaction products. How...
Stereospecific preparation of (Z)-α-fluorostilbenes via a kinetically controlled palladium-catalyzed cross-coupling reaction of high E/Z ratio 1-bromo-1-fluorostyrenes and aryl stannanes
作者:Jianjun Xu、Donald J Burton
DOI:10.1016/s0040-4039(02)00357-x
日期:2002.4
for 1-bromo-1-fluorostyrenes by isomerization from the original E/Z ratios of approximately 1:1. The palladium-catalyzed cross-coupling reaction of high E/Z ratio 1-bromo-1-fluorostyrenes with aryl stannanes gives (Z)-α-fluorostilbenes stereospecifically in good yields.
A halon-free method for the synthesis of ‑bromofluoroolefins utilizing ethyldibromofluoro-acetate is disclosed via a Wittigtypereaction. The reaction system takes advantage of inexpensive and readily available reagents. The method was applied to a wide variety of aryl aldehydes. Both electron donating and electron withdrawing moieties on the aryl ring were tolerated and the desired olefin products