A bisphosphoric acid-catalyzed 1,3-dipolar cycloaddition of buta-2,3-dienoates with azomethine ylides yields 3-methylenepyrrolidine derivatives with excellent enantioselectivity (up to 97% ee).
Design and Enantioselective Construction of Axially Chiral Naphthyl-Indole Skeletons
作者:Hong-Hao Zhang、Cong-Shuai Wang、Can Li、Guang-Jian Mei、Yuxue Li、Feng Shi
DOI:10.1002/anie.201608150
日期:2017.1.2
The firstenantioselective construction of a new class of axially chiral naphthyl‐indole skeletons has been established by organocatalyticasymmetric coupling reactions of 2‐naphthols with 2‐indolylmethanols (up to 99 % yield, 97:3 e.r.). This approach not only affords a new type of axially chiral heterobiaryl backbone, but also provides a new catalyticenantioselective strategy for constructing axially
Telescoping Reactions with Trifluorodiazoethane-Derived Aza-Wittig Reagents and Allenyl esters
作者:Fa-Guang Zhang、Jun-Liang Zeng、Yi-Qiang Tian、Yan Zheng、Dominique Cahard、Jun-An Ma
DOI:10.1002/chem.201801171
日期:2018.5.28
developed for the novel functionalization of allenyl esters. First, new phosphazenes derived from trifluorodiazoethane and phosphines were generated and reacted with allenyl esters to give unexpected α‐iminophosphoranes through the creation of C=P, C=N, and C−H bonds at the α‐, β‐, and γ‐carbon atoms, respectively, of the allenyl esters. The α‐iminophosphoranes did not react with aldehydes in a classic Wittig
Enantioselective Construction of Spiro[indoline-3,2′-pyrrole] Framework via Catalytic Asymmetric 1,3-Dipolar Cycloadditions Using Allenes as Equivalents of Alkynes
作者:Cong-Shuai Wang、Ren-Yi Zhu、Jian Zheng、Feng Shi、Shu-Jiang Tu
DOI:10.1021/jo502516e
日期:2015.1.2
The first catalyticasymmetric1,3-dipolarcycloadditions (1,3-DCs) of isatin-derived azomethine ylide with allenes have been established, which efficiently assembly isatins, amino-esters and 2,3-allenoate into enantioenriched spiro[indoline-3,2′-pyrrole] derivatives with a quaternary stereogenic center in generally high enantioselectivities (80–98% ee). In this allene-involved 1,3-DC, an unexpected
Enantioselective [3 + 2] Cycloaddition of Allenes to Acrylates Catalyzed by Dipeptide-Derived Phosphines: Facile Creation of Functionalized Cyclopentenes Containing Quaternary Stereogenic Centers
作者:Xiaoyu Han、Youqing Wang、Fangrui Zhong、Yixin Lu
DOI:10.1021/ja1106282
日期:2011.2.16
A new family of dipeptide-based chiral phosphines was designed and prepared. D-Thr-L-tert-Leu-derived catalyst 4c promoted [3 + 2] cycloaddition of allenoates to α-substituted acrylates in a regiospecific and stereoselective manner, furnishing functionalized cyclopentenes with quaternary stereogenic centers in high yields and with excellent enantioselectivities.