Synthesis ofgem-Difluorocyclopropa(e)nes and O-, S-, N-, and P-Difluoromethylated Compounds with TMSCF2Br
摘要:
Two-in-one: Me3 SiCF2 Br is an efficient difluorocarbene source and is compatible with both neutral and aqueous basic conditions. Bromide-ion-initiated [2+1] cycloaddition with alkenes/alkynes and hydroxide ion promoted α-addition with (thio)phenols, (thio)alcohols, sulfinates, heterocyclic amines, and H-phosphine oxides give the corresponding gem-difluorinated compounds with broad functional-group tolerance.
Deoxygenative <i>gem</i>-difluoroolefination of carbonyl compounds with (chlorodifluoromethyl)trimethylsilane and triphenylphosphine
作者:Fei Wang、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.3762/bjoc.10.32
日期:——
phosphonium ylide represents one of the most straightforward methods. RESULTS: The combination of (chlorodifluoromethyl)trimethylsilane (TMSCF2Cl) and triphenylphosphine (PPh3) can be used for the synthesis of gem-difluoroolefins from carbonyl compounds. Comparative experiments demonstrate that TMSCF2Cl is superior to (bromodifluoromethyl)trimethylsilane (TMSCF2Br) and (trifluoromethyl)trimethylsilane
Difluoromethylation of Phenols and Thiophenols with the <i>S</i>-(Difluo-romethyl)sulfonium Salt: Reaction, Scope, and Mechanistic Study
作者:Guo-Kai Liu、Wen-Bing Qin、Xin Li、Li-Ting Lin、Henry N. C. Wong
DOI:10.1021/acs.joc.9b02424
日期:2019.12.20
A facile and practical approach for the difluoromethylation of phenols and thiophenols was described. Making use of the recently developed bench-stable S-(difluoromethyl)sulfonium salt as the difluorocarbene precursor, a wide variety of diversely functionalized phenols and thiophenols were readily converted to their corresponding aryl difluoromethyl ethers in good to excellent yields in the presence
exhibited a linear relationship and a reaction parameter (ρ)=+0.56±0.02, which indicated that the trifluoromethylation reaction proceeded via a nucleophilic reactive species. Complex 2 reacts with phenols to produce aryl difluoromethyl ethers in modest‐to‐excellent yields. Mechanisticinvestigations revealed that the difluoromethylation reaction proceeds by initial copper‐mediated formation of difluorocarbene
PYRAZOLOPYRIMIDINYL INHIBITORS OF UBIQUITIN-ACTIVATING ENZYME
申请人:Millennium Pharmaceuticals, Inc.
公开号:US20130217682A1
公开(公告)日:2013-08-22
Disclosed are chemical entities that inhibit ubiquitin-activating enzyme (UAE), each of which is a compound of Formula I:
or a pharmaceutically acceptable salt thereof, wherein Y is
and W, Z, X
Y
, R
Y1
, R
Y2
and R
Y3
are defined herein; pharmaceutical compositions comprising the chemical entities; and methods of using the chemical entities. These chemical entities are useful for treating disorders, particularly cell proliferation disorders, including cancers.
Divergent Generation of the Difluoroalkyl Radical and Difluorocarbene via Selective Cleavage of C–S Bonds of the Sulfox-CF<sub>2</sub>SO<sub>2</sub>Ph Reagent
作者:Shali Li、Xiu Wang、Yide Yang、Chuanfa Ni、Jinbo Hu
DOI:10.1021/acs.orglett.3c04116
日期:2024.2.2
A new difluoroalkylation reagent Sulfox-CF2SO2Ph bearing both sulfoximine and sulfone moieties was prepared from commercially available SulfoxFluor and PhSO2CF2H. On one hand, the Sulfox-CF2SO2Ph reagent could act as a (phenylsulfonyl)difluoromethyl radical source under photoredox catalysis, in which the arylsulfoximidoyl group is selectively removed. On the other hand, under basic conditions, Sulfox-CF2SO2Ph
由市售SulfoxFluor和PhSO 2 CF 2 H制备了一种新型二氟烷基化试剂Sulfox-CF 2 SO 2 Ph,该试剂同时具有亚砜亚胺和砜部分。一方面,Sulfox-CF 2 SO 2 Ph试剂可以充当(苯磺酰基)光氧化还原催化下的二氟甲基自由基源,其中芳基亚磺酰亚胺酰基被选择性去除。另一方面,在碱性条件下,Sulfox-CF 2 SO 2 Ph可以作为二氟卡宾前体,分别与S-和O-亲核试剂进行S-和O-二氟甲基化,其中Sulfox-CF 2 SO中的苯磺酰基2 Ph 被选择性去除(随后芳基亚磺酰亚胺酰基的 α-消除)。