Chiral oximes in asymmetric synthesis. Addition of organometallic reagents to o-(1-phenylethyl) aldoximes
作者:David S. Brown、Peter T. Gallagher、Andrew P. Lightfoot、Christopher J. Moody、Alexandra M.Z. Slawin、Elizabeth Swann
DOI:10.1016/0040-4020(95)00711-g
日期:1995.10
Addition of Grignard and organolithium reagents to O-(1-phcnylethyl) aldoximes in the presence of boron trifluoride etherate gives secondary hydroxylamines in 21–84% yield with up to 95% diastercomeric excess.
An efficient oxidative aminooxyarylation of alkenes under a transition-metal-free condition was described. Under the reaction conditions, N-hydroxyphthalimide (NHPI) reacted readily with N-arylacrylamides to produce cyclic products via a radical C–H functionalization process, achieving both C–O and C–C bonds formation in one pot. This reaction provided a facile access to the valuable aminooxylated
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
Generation and Confinement of Long-Lived <i>N</i>-Oxyl Radical and Its Photocatalysis
作者:Chaofeng Zhang、Zhipeng Huang、Jianmin Lu、Nengchao Luo、Feng Wang
DOI:10.1021/jacs.7b12928
日期:2018.2.14
Generation of controllable carbon radical under the assistance of N-oxyl radical is an efficient method for the activation of C-H bonds in hydrocarbons. We herein report that irradiation of α-Fe2O3 and N-hydroxyphthalimide (NHPI) under 455 nm light generates phthalimide-N-oxyl radical (PINO*), which after being formed by oxidation with holes, is confined on α-Fe2O3 surface. The half-life time of the
Compounds having the formula
1
are methionine aminopeptidase type 2 (MetAP2) inhibitors and are useful for inhibiting angiogenesis. Also disclosed are MetAP2-inhibiting compositions and methods of inhibiting angiogenesis in a mammal.