Direct Allylic C(sp3)-H Alkylation with 2-Naphthols via Cooperative Palladium and Copper Catalysis: Construction of Cyclohexadienones with Quaternary Carbon Centers
作者:Ming Jin、Wei Ren、Dang-Wei Qian、Shang-Dong Yang
DOI:10.1021/acs.orglett.8b02910
日期:2018.11.16
Pd(PPh3)4/Cu(MeCN)4PF6 cooperative catalysis under mild base-free conditions. Special tolerance was observed with peptides, allowing late-stage modifications of peptides. The transformation provides a general protocol to obtain functionalized cyclohexadienones with quaternary carbon centers under two alternative sets of conditions and serves as a complementary catalysis system for the dearomatization of
Iron(II) Chloride-Catalyzed Nitrene Transfer Reaction for Dearomative Amination of β-Naphthols with Aryl Azides
作者:Dun-Qi Wu、Zhen-Yu Guan、Yi Peng、Jian Sun、Cheng Zhong、Qing-Hai Deng
DOI:10.1002/adsc.201800810
日期:2018.12.21
nitrogen‐containing quaternarycarboncenter catalyzed by cheap and readily available iron salt FeCl2, and affords a series of α‐amino‐β‐naphthalenones in good to excellent yields under simple and mild reaction conditions. Preliminary experimental and computational studies suggest that the reaction is probably initiated by iron‐iminyl diradical and followed by intramolecular hydrogen transfer to generate iron‐aminyl
Regioselective benzoyloxylative dearomatization of naphthols by benzoyl peroxide under catalyst-free conditions
作者:Hong-Wei Chen、Qin-Hua Song
DOI:10.1039/d1ob01274f
日期:——
A direct regioselective benzoyloxylative dearomatization of both α- and β-naphthols by benzoyl peroxide under an air atmosphere, and radical inhibitor- and catalyst-free conditions at room temperature is described. The methodology provides a new efficient strategy for the construction of α-ketol derivatives bearing an oxo-quaternary carbon center from naphthols with good to excellent yields.
A Pd-catalyzed linear selective intermolecular asymmetric dearomative allylicalkylation reaction of naphthols with alkoxyallenes under mild reaction conditions is reported. The transformation is successfully promoted by Pd2(dba)3 and the chiral Trost ligand and provides a general atom-efficient protocol to obtain various β-naphthalenones bearing an all carbon quaternary stereogenic center in good
The first highly stereoselective intermolecular catalytic asymmetricdearomatization (CADA) of α-naphthols through C–C formation and the first asymmetricallylicdearomatization of naphthols by chiral organocatalysis have been achieved. These new and complete atom-economic reactions provide enantioriched α- and β-naphthalenones bearing an all-carbon quaternary center.