Herein a new synthetic route to 1,2-amino alcohols is presented by using C-H amidation of sp(3) methyl C-Hbonds as a key step. Readily available alcohols were employed as starting materials after converting them to removable ketoxime chelating groups. Iridium catalysts were found to be effective for the C-H amidation, and LAH reduction was then used to furnish beta-amino alcohol products.
3. leads to amide products which can be hydrolyzed under mild conditions. The amidation reaction is mild, general and compatible with both primary C−H bonds of tertiary and secondary alcohols, as well as secondary C−H bonds of cyclic secondary alcohols. This method provides an easy access to free 1,2-aminoalcohols after efficient and mild cleavage of the oxime directing group and activated amide.
Organophotoredox-Catalyzed Formation of Alkyl–Aryl and −Alkyl C–S/Se Bonds from Coupling of Redox-Active Esters with Thio/Selenosulfonates
作者:Yue Dong、Peng Ji、Yueteng Zhang、Changqing Wang、Xiang Meng、Wei Wang
DOI:10.1021/acs.orglett.0c03624
日期:2020.12.18
A mild organophotoredox synthetic protocol for forming a Csp3–S/Se bond by reacting widespread redox-active esters with thio/selenosulfonates has been developed. The power of the synthetic manifold is fueled by an unprecedented broad substrate scope and wide functional group tolerance.
已经开发出一种温和的有机光氧化还原合成方案,通过使广泛的氧化还原活性酯与硫代/硒磺酸盐反应形成 C sp 3 –S/Se 键。前所未有的广泛底物范围和广泛的官能团耐受性推动了合成歧管的力量。
Rhodium(<scp>iii</scp>)-catalyzed directed amidation of unactivated C(sp<sup>3</sup>)–H bonds to afford 1,2-amino alcohol derivatives
作者:Yi Dong、Jiajing Chen、Heng Xu
DOI:10.1039/c8cc05637d
日期:——
A rhodium-catalyzed directed C(sp3)–H amidation to afford 1,2-amino alcohol oxime derivatives has been developed with good yields and a broad substrate scope. In previous methods for this type of reaction, 1-arylethan-1-ol oxime analogues were challenging substrates owing to strong competition fromC(sp2)–H bondactivation. This Rh-catalyzed C–H activation method overcomes the limitation of competitive
Compounds of formula (I):
wherein R¹ is optionally substituted phenyl and R is a cycloalkyl group having an alkyl substituent in the 1-position; or R¹ is phenyl substituted by at least one fluorine atom and/or at least one trifluoromethyl group and R is hydrogen or an organic radical, and their salts and esters, are useful in the treatment of bacterial infections in humans and animals.