Chiral Phosphine-Catalyzed Enantioselective Construction of γ-Butenolides Through Substitution of Morita−Baylis−Hillman Acetates with 2-Trimethylsilyloxy Furan
作者:Ying-Qing Jiang、Yong-Ling Shi、Min Shi
DOI:10.1021/ja802422d
日期:2008.6.1
Chiral multifunctional phosphine (R)-N-(2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-yl)methanesulfonamide L2 or (R)-N-(2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-yl)acetamide L3 is an efficient catalyst in the allylic substitutions of MBH acetates 1 with 2-trimethylsilyloxy furan 2 to provide gamma-butenolides 3 in good to excellent yields and enantiomeric excesses in the presence of water.
Acetates of Baylis-Hillman adducts derived from ethyl acrylate, methyl vinyl ketone, and acrylonitrile were coupled with allyltributylstannane using Pd(PPh3)4 or Pd(dba)2 as the catalyst at room temperature to afford the corresponding trisubstituted alka-1,5-dienes in good to high yields.
Chiral Bifunctional Thiourea-Phosphane Organocatalysts in Asymmetric Allylic Amination of Morita-Baylis-Hillman Acetates
作者:Hong-Ping Deng、Yin Wei、Min Shi
DOI:10.1002/ejoc.201001660
日期:2011.4
A series of new chiralbifunctionalthiourea-phosphane catalysts was synthesized and successfully applied in the catalytic, asymmetricallylicamination of Morita-Baylis-Hillman (MBH) acetates derived from the methyl vinyl ketone (MVK) or ethyl vinyl ketone (EVK) system, with phthalimide, affording the amination products in up to over 99 % yield and 90 % ee for a wide range of substrates derived from
Baylis–Hillman acetates in organic synthesis: convenient one-pot synthesis of α-carboline framework – a concise synthesis of neocryptolepine
作者:Deevi Basavaiah、Daggula Mallikarjuna Reddy
DOI:10.1039/c2ob26339d
日期:——
A convenient, facile, and one-pot methodology for the synthesis of α-carbolines from Baylis–Hillman (BH) acetates, involving three steps (reactions), (1) mono alkylation of 2-nitroarylacetonitriles with BH-acetates, (2) reduction of nitro group into amino group using Fe/AcOH and (3) formation of two (five and six membered) rings, is presented. This methodology is successfully applied to the synthesis
Chiral phosphine-catalyzed regio- and enantioselective allylic amination of Morita–Baylis–Hillman acetates
作者:Guang-Ning Ma、Shu-Hua Cao、Min Shi
DOI:10.1016/j.tetasy.2009.03.040
日期:2009.5
Enantioselective allylic substitution of Morita–Baylis–Hillman (MBH) acetates with phthalimide was realized in the presence of a novel l-proline-derived chiral trifunctional phosphine amide ligand to give the corresponding allylicamination adducts in good yields (70–95%) and in modest to good enantioselectivities (34–78% ee’s).