One-pot synthesis of tertiary alkyl fluorides from methyl oxalates by radical deoxyfluorination under photoredox catalysis
作者:Julien Brioche
DOI:10.1016/j.tetlet.2018.10.063
日期:2018.12
Tertiary alkyl fluorides have been prepared from methyl oxalates derived from tertiary alcohols by a sequential one-pot hydrolysis/photoredox catalyzed radical deoxyfluorination sequence. The reaction operates under mild conditions and tolerates a wide range of functional groups. This method provides an alternative approach to ionic deoxyfluorination transformations for the incorporation of Carbone–Fluorine
Development of an Easy-To-Handle Redox Active Group for Alcohols: Catalytic Transformation of Tertiary Alcohols to Nitriles
作者:Seunghee Lee、Gyumin Kang、Sunkyu Han
DOI:10.1021/acs.orglett.4c01580
日期:2024.7.12
activated alcohol derivatives is desirable, as alcohols can be utilized in various radical-mediated reactions. Herein, we introduce α-N-phthalimido-oxy isobutyrate (NPIB) as a novel activating group for alcohols. Essentially, it is a more chemically robust alternative to Overman’s N-phthalimidoyl oxalate group. The utility of the NPIB group is showcased in the conversion of tertiaryalcohols to nitriles
通过 SET 介导的活化醇衍生物脱氧生成自由基中间体是理想的,因为醇可用于各种自由基介导的反应。在这里,我们引入α- N-邻苯二甲酰亚胺氧基异丁酸酯(NPIB)作为一种新型的醇活化基团。从本质上讲,它是 Overman 的N-邻苯二甲酰亚氨基草酸酯基团的化学稳定性更强的替代品。 NPIB 基团的实用性体现在在 Ir/Cu 双催化剂下以及在 TMSCN 存在下在蓝色 LED 照射下将叔醇转化为腈。借助我们新开发的 NPIB 手柄,衍生自羧酸的N-羟基邻苯二甲酰亚胺酯的反应活性可以通过天然和商业上更丰富的醇底物实现。
Biohydroxylation Reactions Catalyzed by Enzymes and Whole-Cell Systems
作者:Sabine L. Flitsch、Suzanne J. Aitken、Cathy S.-Y. Chow、Gideon Grogan、Adam Staines
DOI:10.1006/bioo.1999.1135
日期:1999.4
The biohydroxylation of a number of cyclic substrates (3-24) containing aromatic side chains was used to compare substrate specificity and selectivity of hydroxylation using microbial enzymes and whole-cell biocatalysts. In general, the regioselectivity of reaction was remarkably similar between the different catalysts in that little aromatic or benzylic, but significant aliphatic hydroxylation was observed. However, a more detailed investigation of isolated products showed complementary substrate specificity, functional group compatibility, and regioselectivity of hydroxylation. Substrate specificity and regioselectivity could be further modulated by small changes to the nature of the aromatic side chain, which appears to play an important role in substrate recognition, (C) 1999 Academic Press.