Citation: Lu Fu-Dong, Jiang Xuan, Lu Liang-Qiu, Xiao Wen-Jing. Application of Propargylic Radicals in Organic Synthesis[J]. Acta Chimica Sinica, ;2019, 77(9): 803-813. doi: 10.6023/A19060201 shu

Application of Propargylic Radicals in Organic Synthesis

Lu Fu-Dong ^a ,
Jiang Xuan ^a ,
Lu Liang-Qiu ^a,, ,
Xiao Wen-Jing ^a,b,,

a.
Key Laboratory of Pesticide & Chemical Biology Ministry of Education and College of Chemistry, Central China Normal University, Wuhan 430079
b.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032

Corresponding author: Lu Liang-Qiu, luliangqiu@mail.ccnu.edu.cn Xiao Wen-Jing, wxiao@mail.ccnu.edu.cn
Received Date: 8 June 2019
Available Online: 13 September 2019
Fund Project: the National Natural Science Foundation of China 21772053the Natural Science Foundation of Hubei Province 2017AHB047the Natural Science Foundation of Hubei Province 2015CFA033the National Natural Science Foundation of China 21772052Project supported by the National Natural Science Foundation of China (Nos. 21572074, 21772052 and 21772053) and the Natural Science Foundation of Hubei Province (Nos. 2015CFA033, 2017AHB047)the National Natural Science Foundation of China 21572074

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The production and transformation of alkynes occupys an important position in organic synthetic chemistry. Within this realm, propargylic functionalization of alkynes is a feasible way towards this purpose. Especially, the propargylic functionalization via radical pathways has flourished in the last decade, which is believed to be a significant complement to the classic metal-catalyzed propargylation reaction involving cationic intermediates. According to the reaction modes, these advancements will be highlighted by classifying into four types. The first one is the propargylic functionalization reactions involving propargylic radicals. Generally, propargylic radicals can be generated through single electron reduction of alkyne substrates by low-valence metal catalysts or excited state of photocatalysts, then participated in the following cross-coupling reactions to achieve alkyne products. In this part, asymmetric variants have been also well developed. The second one is the preparation of allene compounds through the allenyl radical pathway. For these processes, propargylic radicals can isomerize to allenyl radicals, which can participate in the copper-or nickel-catalyzed coupling reaction to produce significant allene compounds. The third one is the dehydrative alkylation reaction of propargyl alcohols that involve propargylic radical intermediates, too. Such radical intermediates can be further oxidized to propargylic cation intermediates, followed by a deprotonation to form substituted 1, 3-enyne compounds. The forth one is the synthesis of vinylic alkoxyamines through a propargylic radical route. Initially, propargyl alcohols can be converted to propargylic radical species by the joint action of copper catalysts and TEMPO. The generated propargylic radical species can be captured by TEMPO to form vinylic alkoxyamines. Finally, an outlook on the radical propargylic functionalizations will be provided at the end of this review.
- propargylic radical,
- propargylic functionalization,
- alkyne,
- allene,
- transition metal catalysis
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