Synthesis 2020; 52(04): 609-618
DOI: 10.1055/s-0039-1690746
paper
© Georg Thieme Verlag Stuttgart · New York

Halogen-Radical-Promoted Dearomative Aza-Spirocyclization of Alkynylimines: An Efficient Approach to 3-Halo-Spirocyclohexadienones

Dianpeng Chen
a   Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. of China   Email: chendp@zju.edu.cn   Email: shanyying@zju.edu.cn
,
Jianming Li
a   Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. of China   Email: chendp@zju.edu.cn   Email: shanyying@zju.edu.cn
,
Yingying Shan
a   Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. of China   Email: chendp@zju.edu.cn   Email: shanyying@zju.edu.cn
,
Peiying Cui
a   Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. of China   Email: chendp@zju.edu.cn   Email: shanyying@zju.edu.cn
,
Yutong Zhao
a   Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. of China   Email: chendp@zju.edu.cn   Email: shanyying@zju.edu.cn
,
Laijin Tian
a   Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. of China   Email: chendp@zju.edu.cn   Email: shanyying@zju.edu.cn
,
b   College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, P. R. of China   Email: qiuguanyinsheng@mail.zjxu.edu.cn
c   School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Hunan 411201, P. R. of China
› Author Affiliations
This work was supported by the Natural Science Foundation of Shandong­ Province (No. ZR2018BB029, No. ZR2019PB004) and National Natural Science Foundation of China (21772067).
Further Information

Publication History

Received: 21 September 2019

Accepted after revision: 31 October 2019

Publication Date:
13 November 2019 (online)


Abstract

A novel halogen-radical-promoted dearomative aza-spiro­cyclization of alkynylimines for the synthesis of 3-halo-spirocyclohexadienones is described. In this process, it is believed that a radical addition, 5-exo-trig cyclization, and dearomative aza-spirocyclization are involved. Easily available starting materials, mild conditions, and a wide substrate scope make this approach potentially useful.

Supporting Information