S-, N-, and Se-Difluoromethylation Using Sodium Chlorodifluoroacetate
作者:Vaibhav P. Mehta、Michael F. Greaney
DOI:10.1021/ol402370f
日期:2013.10.4
thiols is reported using chlorodifluoroacetate as the difluoromethylating agent. This cheap reagent undergoes smooth decarboxylation at 95 °C to afforddifluorocarbene, which can be trapped with a variety of aromatic and heteroaromatic thiols. The reaction is also effective for the difluoromethylation of heterocyclic nitrogen compounds and phenylselenol.
Visible-Light Photoredox Difluoromethylation of Phenols and Thiophenols with Commercially Available Difluorobromoacetic Acid
作者:Jinyan Yang、Min Jiang、Yunhe Jin、Haijun Yang、Hua Fu
DOI:10.1021/acs.orglett.7b01118
日期:2017.5.19
A simple and efficient visible-light photoredox one-pot method for difluoromethylation of phenols and thiophenols has been developed. The protocol uses commerciallyavailable, inexpensive, and easy handling difluorobromoacetic acid as the difluoromethylating agent, and the diverse O- and S-difluoromethylated products were prepared in good yields with tolerance of many functional groups.
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
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)。