Xie H, Zeng YF, Shu B, Liang JY, Huang ZJ, Chen SY, Zheng YC, Liu YZ, Zhang SS. Mild Synthesis of 3,4-Dihydroisoquinolin-1(2
H)-ones via Rh(III)-Catalyzed Tandem C-H-Allylation/N-Alkylation Annulation with 2-Methylidenetrimethylene Carbonate.
J Org Chem 2021;
86:17063-17070. [PMID:
34797073 DOI:
10.1021/acs.joc.1c02179]
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Abstract
A tandem rhodium(III)-catalyzed system was established to access 3,4-dihydroisoquinolin-1(2H)-one by coupling of N-methoxy-3-methylbenzamide with 2-methylidenetrimethylene carbonate. This one-pot synthesis protocol processed smoothly under mild reaction conditions. Moreover, a total of 28 examples, broad substrate scope, and high functional-group compatibility were observed. Preliminary mechanism studies were also conducted and demonstrated that the rhodium(III) catalyst played a vital role in the C-H-allylation and N-alkylation cyclization process.
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