Atom Efficient Synthesis of Selectively Difluorinated Carbocycles through a Gold(I)-Catalyzed Cyclization
作者:Adam W. McCarter、Magdalena Sommer、Jonathan M. Percy、Craig Jamieson、Alan R. Kennedy、David J. Hirst
DOI:10.1021/acs.joc.8b01121
日期:2018.8.17
Difluorinated enol acetals bearing a pendant alkene group can be cyclized and reduced in one pot to form fluorinated diol motifs. Alternatively, the cyclization of terminal alkynes allows for the synthesis of fluorinated pyran scaffolds. Both cyclization processes can be performed under mild conditions allowing access to complex products rich in functionality. The cyclic systems are synthesized concisely
New fluorine-containing building blocks from trifluoroethanol. 1
作者:Sunita T. Patel、Jonathan M. Percy、Robin D. Wilkes
DOI:10.1016/0040-4020(95)00525-d
日期:1995.8
A new fluorine containing acyl anionequivalent 1,1-difluoro-2-lithio-2-[(methoxyethoxy)methoxy]ethene 12 has been prepared from trifluoroethanol and trapped with a number of electrophiles in good yield. Effective electrophiles included Group(IV) halides and carbonyl compounds. Attempts to alkylate using iodomethane were unsuccessful.
Concise Syntheses of γ-Oxo-β,β-difluorinated Amino Acids via Chelated [3,3]-Rearrangement of Difluoroallylic Alcohols
作者:Jonathan M. Percy、Michael E. Prime、Michael J. Broadhurst
DOI:10.1021/jo981119h
日期:1998.10.1
Synthesis of α-hydroxy-β,β-difluoro-γ-ketoesters via [3,3]sigmatropic rearrangements
作者:Michael J. Broadhurst、Samantha J. Brown、Jonathan M. Percy、Michael E. Prime
DOI:10.1039/b004766j
日期:——
Readily available γ,γ-difluorinated allylic alcohols obtained from trifluoroethanol were esterified efficiently. Exposure to strong base (LDA) afforded the ester enolates, in which chelation both controlled configuration and stabilised against fragmentation, which were trapped as their silyl ketene acetals. Rearrangement occurred to afford base-sensitive acid products. Esterification under mild conditions
Chelated [3,3]-rearrangements of difluoroallylic alcohols
作者:M.J. Broadhurst、J.M. Percy、M.E. Prime
DOI:10.1016/s0040-4039(97)01315-4
日期:1997.8
Whereas the lithium enolates of acetate and propionate esters of difluoroallylic alcohols fragment rapidly, even at -78 degrees C, methoxy-and benzyloxy-acetates form chelated enolates which undergo smooth [3,3]-rearrangement as their silyl ketene acetals. The latent ketone function can be revealed under mild conditions (MeOH, SOCl2) to afford very highly functionalised CF2 compounds. (C) 1997 Elsevier Science Ltd.