An efficient Ni-catalyzed hydrodifluoroalkylation of unactivated alkenes with bromodifluoroacetate by using PhSiH3 as hydride source was developed. The transformation affords aliphatic difluorides with anti-Markovnikov regioselectivity. A wide range of highly remote alkenes, simple alkenes, drug molecules, commercially available CF2 precursors, and even nonfluorinated substrates are competent in this
Direct Access to α,α-Difluoroacylated Arenes by Palladium-Catalyzed Carbonylation of (Hetero)Aryl Boronic Acid Derivatives
作者:Thomas L. Andersen、Mette W. Frederiksen、Katrine Domino、Troels Skrydstrup
DOI:10.1002/anie.201604152
日期:2016.8.22
of (hetero)aryl boronates or boronicacid salts with carbon monoxide and α‐bromo‐α,α‐difluoroamides and bromo‐α,α‐difluoroesters is described herein. The method is useful for the synthesis of a diverse selection of (hetero)arylα,α‐difluoro‐β‐ketoamides and α,α‐difluoro‐β‐ketoesters, which are useful building blocks for the generation of functionalized difluoroacylated and difluoroalkyl arenes. The
Cu-catalyzed direct C1−H difluoromethylation of pyrrolo[1,2-a]quinoxalines
作者:Yang Li、Zhen Yang、Yali Liu、Yan Liu、Yanlong Gu、Ping Liu
DOI:10.1016/j.mcat.2021.111747
日期:2021.7
An efficient Cu-catalyzed direct C1−H difluoromethylation of pyrrolo[1,2-a]quinoxalines with BrCF2CO2Et or BrCF2CONEt2 has been reported, providing to a series of difluoromethylated pyrrolo[1,2-a]quinoxalines with generally good yields. This approach features good compatibility with substituents, broad substrate scope, and gram-scale synthesis. The further transformations of the products are also examined
已经报道了用 BrCF 2 CO 2 Et 或 BrCF 2 CONEt 2对吡咯并[1,2- a ]喹喔啉进行有效的铜催化直接 C1-H 二氟甲基化,提供了一系列二氟甲基化吡咯并[1,2- a ]喹喔啉产量普遍良好。该方法具有与取代基的良好相容性、广泛的底物范围和克级合成。还检查了产品的进一步转化。
Difluoroalkylation of Tertiary Amides and Lactams by an Iridium-Catalyzed Reductive Reformatsky Reaction
作者:Phillip Biallas、Ken Yamazaki、Darren J. Dixon
DOI:10.1021/acs.orglett.2c00438
日期:2022.3.18
An iridium-catalyzed, reductive alkylation of abundant tertiary lactams and amidesusing 1–2 mol % of Vaska’s complex (IrCl(CO)(PPh3)2), tetramethyldisiloxane (TMDS), and difluoro-Reformatsky reagents (BrZnCF2R) for the general synthesis of medicinally relevant α-difluoroalkylated tertiary amines is described. A broad scope (46 examples), including N-aryl- and N-heteroaryl-substituted lactams, demonstrated