Takeda N, Suganuma R, Yasui M, Ueda M. Synthesis of isolable β-chloroenamines from
N-alkoxylactams with organometallic reagents.
Org Biomol Chem 2023;
21:1435-1439. [PMID:
36649121 DOI:
10.1039/d2ob02151j]
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Abstract
An efficient approach to access isolable β-chloroenamines via nucleophilic addition/dehydration of α-chloro N-alkoxylactam with organolithium and Grignard reagents is reported. This approach is amenable to the synthesis of β-chloroenamines by incorporating various C(sp) and C(sp2) units, such as alkyne, aryl, and heteroaryl moieties. The sequential reaction has a broad substrate scope and can be carried out for a scalable synthesis of β-chloroenamines. Control experiments suggested that both chloro and alkoxy groups act as inductive electron-withdrawing substituents to improve the stability of the enamines.
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