Synthesis and functionalization of (Z)-1,2-difluoro-1-tri-n-butylstannyl-1,4-pentadiene
摘要:
The Zn reagent prepared from (E)-1,2-difluoro-1-iodo-2-triethylsilylethene followed by reaction with allyl bromide gave (Z)-1,2-difluoro-1-triethylsilyl-1,4-pentadiene. Further reaction of (Z)-1,2-difluoro-1-triethylsilyl-1,4-pentadiene with KF, n-Bu3SnCI, in DMF at 70 degrees C gave (Z)-1,2-difluoro-1-tri-n-butylstannyl-1,4-pentadiene. Coupling of (Z)-1,2-difluoro-1-tri-n-butylstannyl-1,4-pentadiene with substituted aryl iodides under Stille-Libeskind (Pd(PPh3)(4)/Cu(I)I) conditions gave the arylated product. Similar coupling of perfluorovinyl iodides stereospecifically gave the corresponding trienes. Hydroboration/oxidation with 9-BBN and H2O2 of (Z)-1,2-difluoro-1-tri-n-butylstannyl-1,4-pentadiene gave (Z)-4,5-difluoro-5-tri-n-butylstannyl-4-penten-1-ol. Additional couplings of (Z)-4,5-difluoro-5-tri-n-butylstannyl-4-penten-1-ol with substituted aryl iodides under Stille-Libeskind conditions gave the corresponding difunctionalized molecule. (C) 2014 Elsevier B.V. All rights reserved.
Fluoride ion-catalyzed generation and carbonyl addition of α-halo carbanions derived from α-halo organosilicon compounds
作者:Makoto Fujita、Michio Obayashi、Tamejiro Hiyama
DOI:10.1016/s0040-4020(01)86661-8
日期:1988.1
The title carbanion species are generated from the corresponding α-haloorganosilicon compounds by the action of a catalytic amount of tris(diethylamino)sulfonium difluorotrimethylsilicate and are found to undergo addition to aldehyde carbonyl efficiently at ambient temperature. The synthetic potential of the reaction is demonstrated by application to the synthesis of some insecticides.
The Reaction of 2-X-1, 2-Difluoroalk-1-enyldifluoroboranes with Xenon Difluoride. A Methodical Approach to 1, 2-Difluoroalk-1-enylxenon(II) Salts
作者:Hermann-Josef Frohn、Nicolay Yu. Adonin、Vadim V. Bardin
DOI:10.1002/zaac.200300234
日期:2003.12
2-X-1, 2-Difluoroalk-1-enylxenon(II) salts were prepared by the reaction of XeF2 with XCF=CFBF2 (X = F, trans-H, cis-Cl, trans-Cl, cis-CF3, cis-C2F5) but no organoxenon(II) compounds were obtained when the trans-isomers of boranes, trans-XCF=CFBF2 (X = CF3, C4F9, C4H9, Et3Si), were used under similar conditions. Reaktionen von 2-X-1, 2-Difluoralk-1-enyldifluorboranen mit Xenondifluorid. Untersuchung
2-X-1, 2-Difluoroalk-1-enylxenon(II) 盐是通过 XeF2 与 XCF=CFBF2 (X = F, trans-H, cis-Cl, trans-Cl, cis-CF3, cis -C2F5) 但在类似条件下使用硼烷的反式异构体反式-XCF=CFBF2 (X = 、C4F9、C4H9、Et3Si) 时,没有得到有机氧 (II) 化合物。Reaktionen von 2-X-1, 2-Difluoralk-1-enyldifluorboranen mit Xenondifluorid。Untersuchung des methodischen Zugangs zu 1, 2-Difluoralk-1-enylxenon(II)salzen 2-X-1, 2-Difluoralk-1-enylxenon(II)salze wurden bei der Reaktion
The stereoselective preparation of cis and trans-1,2-difluoroethylene synthons
作者:Simonetta A. Fontana、Charles R. Davis、Ya-Bo He、Donald J. Burton
DOI:10.1016/0040-4020(95)00861-2
日期:1996.1
Isomerization of (Z)-HFC=CFSiEt3 with ultraviolet light and catalytic phenyl disulfide has resulted in a high yield, stereoselectivepreparation of cis-1,2-difluorotriethylsilylethylene, (E)-HFC=CFSiEt3. (E)-HFC=CFSiEt3 has been converted to (Z)-F(Bu3Sn)C=CFSiEt3, (Z)-IFC=CFSiEt3, (Z)-BrFC=CFSiEt3, (Z)-Me3SiFC=CFSiEt3, and (Z)-IFC=CFI. (E)-IFC=CFI has been prepared from (Z)-HFC=CFSiEt3.