Catalytic Asymmetric [2+3] Cyclizations of Azlactones with Azonaphthalenes
作者:Chun Ma、Jia‐Yu Zhou、Yi‐Zhu Zhang、Guang‐Jian Mei、Feng Shi
DOI:10.1002/anie.201801349
日期:2018.5.4
The first catalyticasymmetric [2+3] cyclization of azlactones with azonaphthalenes has been established. This strategy allowed the synthesis of a variety of chiral isatin derivatives in generally good yields and excellent enantioselectivities (up to 99 % yield, 98 % ee). The developed reaction has not only established a catalytic enantioselective [2+3] cyclization using azlactones as two‐carbon building
not only in activating the two substrates, but also in controlling the diastereoselectivity of the reaction via hydrogen-bonding interactions. In addition, this protocol demonstrates the great practicability of utilizing p-QMs in dominoreactions. An efficient domino 1,6-addition/intramolecular cyclization reaction between para-quinone methides (p-QMs) and azlactones under Brønsted acid catalysis was
Brønsted Acid Catalyzed Dehydrative Nucleophilic Substitution of C3-Substituted 2-Indolylmethanols with Azlactones
作者:Guang-Jian Mei、Feng Shi、Chen-Yu Bian、Dan Li、Qian Shi
DOI:10.1055/s-0036-1590929
日期:2018.1
structurally diversified indole derivatives, but also enriches the chemistry of 2-indolylmethanols via dehydrative substitution reaction. An efficient dehydrative nucleophilicsubstitution reaction of C3-substituted2-indolylmethanols with azlactones has been established. In the whole process, Brønstedacid was supposed to activate two substrates simultaneously. A series of structurally diversified indole derivatives
Iridium and a Brønsted acid cooperatively catalyzed chemodivergent and stereoselective reactions of vinyl benzoxazinones with azlactones
作者:Meng Sun、Xiao Wan、Si-Jia Zhou、Guang-Jian Mei、Feng Shi
DOI:10.1039/c8cc08962k
日期:——
Under cooperativecatalysis of iridium and a Brønsted acid, different C4-substituted azlactones react with vinyl benzoxazinones via a formal [4+2] cycloaddition or substitution reaction in a chemo- and stereoselective mode. Furthermore, the catalyticasymmetric version of the formal [4+2] cycloaddition established cooperativecatalysis of iridium and a chiral thiourea-tertiary amine.
(4 + 2) cyclization of aza-<i>o</i>-quinone methides with azlactones: construction of biologically important dihydroquinolinone frameworks
作者:Hai-Qing Wang、Wenjing Ma、Ao Sun、Xin-Yue Sun、Chao Jiang、Yu-Chen Zhang、Feng Shi
DOI:10.1039/d0ob02388d
日期:——
A base-promoted (4 + 2) cyclization of N-(o-chloromethyl)aryl amides with azlactones was established, which helped construct biologically important dihydroquinolinone frameworks in good yields.