A flow electrochemistry-enabled synthesis of 2-substituted N-(methyl-d)piperidines.
A flow electrochemistry-enabled synthesis of 2-substituted N-(methyl-d)piperidines.
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DOI:
10.1002/jlcr.4006
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发表时间:
2022-12
影响因子:
1.8
通讯作者:
Brown, Lynda J.
中科院分区:
文献类型:
--
作者:
AL-Hadedi, Azzam A. M.;Sawyer, Stuart;Elliott, Stuart J.;Green, Robert A.;O'Leary, Daniel J.;Brown, Richard C. D.;Brown, Lynda J.
A synthesis of N‐monodeuteriomethyl‐2‐substituted piperidines is described. An efficient and readily scalable anodic methoxylation of N‐formylpiperidine in an undivided microfluidic electrolysis cell delivers methoxylated piperidine 3, which is a precursor to a N‐formyliminium ion and enables C‐nucleophiles to be introduced at the 2‐position. The isotopically labelled N‐deuteriomethyl group is installed using the Eschweiler–Clarke reaction with formic acid‐d 2 and unlabelled formaldehyde. Monodeuterated N‐methyl groups in these molecular systems possess small isotropic proton chemical shift differences important in the investigation of molecules that are able to support long‐lived nuclear spin states in solution nuclear magnetic resonance. Synthesis of N‐monodeuteriomethyl‐2‐substituted piperidines by efficient and scalable methoxylation of N‐formylpiperidine in an electrochemical flow cell, followed by an Eschweiler–Clarke reaction with formic acid‐d 2 and unlabelled formaldehyde, is described. These monodeuterated N‐methyl possess small isotropic proton chemical shift differences important in the investigation of molecules that are able to support long‐lived nuclear spin states in solution NMR.
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DOI:
10.1039/c8cp00253c
发表时间:
2018-04-18
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
作者:
Elliott SJ ;Meier B ;Vuichoud B ;Stevanato G ;Brown LJ ;Alonso-Valdesueiro J ;Emsley L ;Jannin S ;Levitt MH
通讯作者:
Levitt MH
影响因子:
15
作者:
Allen, BD;O'Leary, DJ
通讯作者:
O'Leary, DJ
DOI:
10.1039/c39790000167
发表时间:
1979-01-01
影响因子:
--
作者:
MALMBERG, M;NYBERG, K
通讯作者:
NYBERG, K
影响因子:
5.2
作者:
Hill-Cousins JT;Pop IA;Pileio G;Stevanato G;Håkansson P;Roy SS;Levitt MH;Brown LJ;Brown RC
通讯作者:
Brown RC
影响因子:
2.1
作者:
BROWN, DS;CHARREAU, P;LEY, SV
通讯作者:
LEY, SV