Processes for Production of 2-Bromo-2,2-Difluoroethanol and 2-(Alkylcarbonyloxy)-1,1-Difluoroethanesulfonic Acid Salt
申请人:Jodry Jonathan Joachim
公开号:US20110015431A1
公开(公告)日:2011-01-20
Disclosed is a process for producing 2-bromo-2,2-difluoroethanol, which comprises reducing a bromodifluoroacetic acid derivative represented by the formula [1] by using an ate hydride complex as a reducing agent. 2-Bromo-2,2-difluoroethanol thus produced can be used as the starting material to carry out the esterification step, the sulfination step and the oxidation step in this order, thereby producing a 2-alkylcarbonyloxy-1,1-difluoroethanesulfonic acid salt, wherein A represents a substituted or unsubstituted linear, branched or cyclic alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 15 carbon atoms, a heteroaryloxy group having 4 to 15 carbon atoms, or a halogen atom.
Processes for Production of 2-Bromo-2,2-Difluoroethanol and 2-(Alkylcarbonyloxy)-1, 1-Difluoroethanesulfonic Acid Salt
申请人:Jodry Jonathan Joachim
公开号:US20110319652A1
公开(公告)日:2011-12-29
Disclosed is a process for producing 2-bromo-2,2-difluoroethanol, which comprises reducing a bromodifluoroacetic acid derivative represented by the formula [1] by using an ate hydride complex as a reducing agent. 2-Bromo-2,2-difluoroethanol thus produced can be used as the starting material to carry out the esterification step, the sulfination step and the oxidation step in this order, thereby producing a 2-alkylcarbonyloxy-1,1-difluoroethanesulfonic acid salt, wherein A represents a substituted or unsubstituted linear, branched or cyclic alkoxy group having 1 to 20 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 15 carbon atoms, a heteroaryloxy group having 4 to 15 carbon atoms, or a halogen atom.
Visible‐Light Photoredox‐Catalyzed Tandem One‐Pot Construction of C4‐Difluoroalkylated Phthalazin‐1(2
<i>H</i>
)‐Ones
作者:Zhen Yao、Ji Yang、Zhenli Luo、Jianhan Ye、Jiahong Han、Xin Zhang、Lijin Xu、Peng Wang、Qian Shi
DOI:10.1002/adsc.202200500
日期:2022.8.16
Tandem one-pot regioselective synthesis of C4-difluoroalkylated phthalazin-1(2H)-ones from readily available hydrazines, 2-formylbenzoic acids and bromodifluoroacetate derivatives under visible-light photocatalysis is reported. This mild protocol provides straightforward access to various C4-difluoroalkylated phthalazin-1(2H)-ones, and displays broad substrate scope and wide functional group tolerance
报道了在可见光光催化下由现成的肼、2-甲酰基苯甲酸和溴二氟乙酸酯衍生物串联一锅区域选择性合成 C4-二氟烷基化 phthalazin-1(2 H )-ones。这种温和的协议提供了对各种 C4-二氟烷基化 phthalazin-1(2 H )-ones 的直接访问,并显示出广泛的底物范围和广泛的官能团耐受性。此外,该方法还适用于合成C4-三氟甲基化和全氟丁基化酞嗪-1(2 H )-酮。fac -[Ir(ppy) 3 ] 光催化剂的使用和有机碱添加剂的引入是催化的关键。