Synthesis 2023; 55(06): 907-918
DOI: 10.1055/a-1959-2742
special topic
Synthetic Advancements Enabled by Phosphorus Redox Chemistry

An Alternative to the Arbuzov Reaction: Generation and Transformation of α-Dialkyl-Substituted Methylphosphonate Carbanions via an SET Reduction Process

Li Zhang
a   School of Fundamental Science, Zhejiang Pharmaceutical University, No. 666 Siming Road, Ningbo 315500, P. R. of China
,
Jianxun Shi
a   School of Fundamental Science, Zhejiang Pharmaceutical University, No. 666 Siming Road, Ningbo 315500, P. R. of China
,
Yewen Fang
b   School of Materials and Chemical Engineering, Ningbo University of Technology, No. 201 Fenghua Road, Ningbo 315211, P. R. of China
› Author Affiliations
This work was supported by the Scientific Research Fund of the Department of Education of Zhejiang Province (No. Y202147855), the Natural Science Project of Zhejiang Pharmaceutical University (No. ZPCSR2020001), the Natural Science Foundation of Ningbo (No. 2021J140), and the Science and Technology Innovation 2025 Major Project of Ningbo (No. 2019B10112).


Abstract

With B-alkyl Suzuki cross-coupling as the strategy, 1-alkyl-substituted ethenylphosphonates could be efficiently accessed via palladium­-catalyzed reactions of α-phosphonovinyl tosylates with B-alkyl-9-borabicyclo[3.3.1]nonane (B-alkyl-9-BBN). Using the α-alkylethenylphosphonates as radical acceptors, visible-light-driven photocatalytic Giese-type and cyclopropanation reactions based on reductive radical-polar crossover have been successfully developed. The redox-neutral photocatalysis serves as a viable strategy for the preparation of various 1,1-dialkyl-substituted methylphosphonates and 1-alkylcyclopropylphosphonates.

Supporting Information



Publication History

Received: 31 July 2022

Accepted after revision: 12 October 2022

Accepted Manuscript online:
12 October 2022

Article published online:
22 November 2022

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