A Sequential Homologation of Alkynes and Aldehydes for Chain Elongation with Optional (13)C-Labeling.

A Sequential Homologation of Alkynes and Aldehydes for Chain Elongation with Optional (13)C-Labeling.
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通过可选的 (13)C 标记对炔烃和醛进行链延长的顺序同系化

DOI:
10.1002/chem.201504248
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Hintermann L
Hintermann L
中科院分区:
--
文献类型:
--
作者:
Brunner A;Hintermann L

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末端炔烃(RCCH)是由Ru催化的一系列反Markovnikov水合反应(RCH2CHO),然后是醛的Bestmann-Ohira炔基化反应(RCH2CCH)。相反,从醛开始颠倒序列会导致醛的互换同源。使用13C标记的Bestmann-Ohira试剂(二甲基((1-13C)-1-重氮-2-氧丙基)膦酸二甲酯)进行炔化反应,提供了直接获得单一或通过额外的同源,多个13C标记的炔烃的途径。标记的炔烃用作合成平台,用于获得大量特定的13C标记的产品。在炔单元上有一个或两个13C-标记的末端炔已被提交给炔-叠氮点击反应;铜催化形式(CuAc)对1,4-对1,5-三嗪异构体的区域选择性为>50 000:1,如13C 波谱分析所示。
Terminal alkynes (RCCH) are homologated by a sequence of ruthenium‐catalyzed anti‐Markovnikov hydration of alkyne to aldehyde (RCH2CHO), followed by Bestmann–Ohira alkynylation of aldehyde to chain‐elongated alkyne (RCH2CCH). Inverting the sequence by starting from aldehyde brings about the reciprocal homologation of aldehydes instead. The use of13C‐labeled Bestmann–Ohira reagent (dimethyl ((1‐13C)‐1‐diazo‐2‐oxopropyl)phosphonate) for alkynylation provides straightforward access to singly or, through additional homologation, multiply13C‐labeled alkynes. The labeled alkynes serve as synthetic platform for accessing a multitude of specifically13C‐labeled products. Terminal alkynes with one or two13C‐labels in the alkyne unit have been submitted to alkyne–azide click reactions; the copper‐catalyzed version (CuAAC) was found to display a regioselectivity of >50 000:1 for the 1,4‐ over the 1,5‐triazine isomer, as shown analytically by13C NMR spectroscopy.
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