Synthesis of polychloromethylated and halogenated spiro[5,5]trienones via dearomative spirocyclization of biaryl ynones

We disclosed a selective polychloromethylation and halogenation reaction of alkynes via a radical addition/spirocyclization cascade sequence, in which polyhaloalkanes were used as the precursor for polyhalomethyl and halogen radicals. Using this strategy, a series of valuable halogen-, CHCl 2 - or C...

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Bibliographic Details
Published in:Organic & biomolecular chemistry 2022-08, Vol.20 (33), p.6659-6666
Main Authors: Li, Jun-Nan, Li, Zi-Jie, Shen, Liu-Yu, Li, Pinhua, Zhang, Yicheng, Yang, Wen-Chao
Format: Article
Language:English
Subjects:
Alkynes
CCL3 protein
Functional groups
Halogenation
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Summary:We disclosed a selective polychloromethylation and halogenation reaction of alkynes via a radical addition/spirocyclization cascade sequence, in which polyhaloalkanes were used as the precursor for polyhalomethyl and halogen radicals. Using this strategy, a series of valuable halogen-, CHCl 2 - or CCl 3 -containing spiro[5,5]trienones were synthesized in good yields with good functional group tolerance in one pot under simple and mild conditions. It is noted that an unprecedented halogenation instead of dibromomethylation was achieved when CH 2 Br 2 was used in this work.
ISSN:1477-0520
1477-0539
DOI:10.1039/d2ob01053d