Cerium ammonium nitrate: a new catalyst for regioselective protection of glycols
摘要:
The regioselective introduction of a methoxymethyl (MOM) group on different type of glycols via an orthoester intermediate was investigated. The novelty presented in this study is the use of ceric ammonium nitrate instead of the previously employed camphorsulfonic acid as catalyst. The monoprotection reaction was revealed to be highly selective when the glycol moiety was in the presence of an ether functionality. (C) 2004 Elsevier Ltd. All rights reserved.
Cerium ammonium nitrate: a new catalyst for regioselective protection of glycols
摘要:
The regioselective introduction of a methoxymethyl (MOM) group on different type of glycols via an orthoester intermediate was investigated. The novelty presented in this study is the use of ceric ammonium nitrate instead of the previously employed camphorsulfonic acid as catalyst. The monoprotection reaction was revealed to be highly selective when the glycol moiety was in the presence of an ether functionality. (C) 2004 Elsevier Ltd. All rights reserved.
important quaternary α-benzyl- and α-allyl-α-methylamino cyclobutanones in good to high yield, via a sequential one-pot methylation/sigmatropic rearrangement, has been accomplished for the first time. The quaternary α-alkyl-α-amino cyclobutanones could be further manipulated, affording synthetically interesting scaffolds such as highlysubstituted tryptamines and cyclobuta-fused indolines.
Photo‐triggered Intramolecular Radical Tandem Regioselective Alkylation/Cyclization of 1,
<scp>6‐Dienes</scp>
with
<scp>Redox‐Active</scp>
Esters Enabled by an
<scp>EDA</scp>
Complex
作者:Bin Sun、Lan Ling、Xiaohui Zhuang、Lulu Yang、Jieli Yin、Can Jin
DOI:10.1002/cjoc.202200516
日期:2023.1
radical tandem alkylation/cyclization between 1,6-dienes and redox-active esters has been developed, affording a series of N-aryl pyrrolidine-2-ones in moderate to good yields. The transformation is driven by the formation of an electron-donor-acceptor (EDA) complex and a subsequent single electron transfer (SET) process. This photocatalyst-free protocol features excellent regioselectivity, mild conditions
meta-Thermocycloadditions of benzene rings was realized for the first time. Distinct to the meta-photocycloadditions, this reaction was proposed to proceed via [4π+2π] cycloadditions of Wheland intermediates from the electrophilic dearomatization of benzene rings. A broad spectrum of readily available C(sp2)-rich aniline-tethered enynes were transformed into C(sp3)-rich 3D complex polycyclic architectures
Cerium ammonium nitrate: a new catalyst for regioselective protection of glycols
作者:María J. Comin、Eleonora Elhalem、Juan B. Rodriguez
DOI:10.1016/j.tet.2004.09.097
日期:2004.12
The regioselective introduction of a methoxymethyl (MOM) group on different type of glycols via an orthoester intermediate was investigated. The novelty presented in this study is the use of ceric ammonium nitrate instead of the previously employed camphorsulfonic acid as catalyst. The monoprotection reaction was revealed to be highly selective when the glycol moiety was in the presence of an ether functionality. (C) 2004 Elsevier Ltd. All rights reserved.