DMAP-catalyzed alkylation of isatin <i>N</i>,<i>N</i>′-cyclic azomethine imine 1,3-dipoles with Morita–Baylis–Hillman carbonates
作者:Shihe Hu、Jian Zhang、Qiaomei Jin
DOI:10.1039/c8nj00234g
日期:——
complex 3-substituted oxindoles. An efficient and convenient synthetic approach to azomethine imines is developed via DMAP-catalyzed direct alkylation at the α-position of the cyclic amine of the new isatin N,N′-cyclic azomethine imines with Morita–Baylis–Hillmancarbonates. A variety of α-alkylated-isatin N,N′-cyclic azomethine imine 1,3-dipoles were obtained in excellent yields (up to 99%) under mild conditions
Enantioselective synthesis of spirocyclic cyclopentenes: asymmetric [3+2] annulation of 2-arylideneindane-1,3-diones with MBH carbonates derivatives catalyzed by multifunctional thiourea–phosphines
作者:Fangle Hu、Yin Wei、Min Shi
DOI:10.1016/j.tet.2012.07.013
日期:2012.9
The [3+2] annulation reactions of 2-arylideneindane-1,3-diones with Morita–Baylis–Hillman (MBH) carbonates proceeded smoothly in the presence of multifunctional thiourea–phosphines to produce the corresponding quaternary carbon centered spirocyclic cyclopentenes in moderate yields, with high diastereoselectivities and enantioselectivities under mild conditions. The plausible reaction has been also
Asymmetric [3+2] Cycloaddition of Olefins with Morita–Baylis–Hillman Carbonates Catalyzed by BINOL-Based Bifunctional Phosphine
作者:Hai-Lei Cui、Xue Tang、Meng-Fan Li、Xing-Jie Xu、Yin Shi
DOI:10.1055/s-0037-1611752
日期:2019.4
series of novel BINOL-based phosphines. These bifunctional organocatalysts can be used in the [3+2] cycloaddition of electron-deficient olefins and Morita–Baylis–Hillman (MBH) carbonates. Moderate to excellent yields (up to >99%) and good to excellent enantioselectivities (up to 95% ee) can be obtained in the cycloaddition reaction of maleimides and MBH carbonates. The application of these novel phosphines
Chiral multifunctional thiourea-phosphine catalyzed asymmetric [3 + 2] annulation of Morita–Baylis–Hillman carbonates with maleimides
作者:Hong-Ping Deng、De Wang、Yin Wei、Min Shi
DOI:10.3762/bjoc.8.121
日期:——
We have developed a multifunctional thiourea-phosphinecatalyzed asymmetric [3 + 2] annulation of Morita-Baylis-Hillman (MBH) carbonates with maleimides, which can efficiently construct functionalized cyclopentenes bearing three contiguous stereocenters in moderate to excellent yields and excellent diastereo- and enantioselectivities. A plausible mechanism has been also proposed on the basis of control
Phosphine-catalyzed asymmetric [4+1] annulation of activated α,β-unsaturated ketones with Morita–Baylis–Hillman carbonates: enantioselective synthesis of spirooxindoles containing two adjacent quaternary stereocenters
作者:Fang-Le Hu、Yin Wei、Min Shi
DOI:10.1039/c4cc03479a
日期:——
The asymmetric [4+1] annulation of activated alpha,beta-unsaturated ketones with MBHcarbonates catalyzed by bifunctional thiourea-phosphine catalysts derived from an axially chiral binaphthyl scaffold has been developed, giving spirooxindoles with two adjacent quaternary stereocenters in good yields with high enantioselectivities and moderate diastereoselectivities under mild conditions.