[reaction: see text] The enantioselective copper(II)-catalyzed Friedel-Crafts addition of indoles to N-sulfonyl aldimines was developed using chiral bisoxazoline as ligands, and high enantioselectivities (up to 96% ee) were achieved.
Enantioselective Reductive Coupling of Acetylene to <i>N</i>-Arylsulfonyl Imines via Rhodium Catalyzed C−C Bond-Forming Hydrogenation: (<i>Z</i>)-Dienyl Allylic Amines
作者:Eduardas Skucas、Jong Rock Kong、Michael J. Krische
DOI:10.1021/ja0715896
日期:2007.6.13
The first highly enantioselective catalytic vinylation of aldimines to furnish allylic amines is reported. Exposure of aromatic and aliphatic N-arylsulfonyl aldimines 1a−12a to equal volumes of acetylene and hydrogen gas at 45 °C and ambient pressure in the presence of chirally modified cationic rhodium catalysts provides the (Z)-dienyl allylic amines 1b−12b in highly optically enriched form (93−98%
γ-Carbon Activation through N-Heterocyclic Carbene/Brønsted Acids Cooperative Catalysis: A Highly Enantioselective Route to δ-Lactams
作者:Yonglong Xiao、Jinxin Wang、Wenjing Xia、Shuangjie Shu、Shenchao Jiao、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.5b01827
日期:2015.8.7
A γ-carbon activation method that operates through N-heterocyclic carbene/Brønsted acidcooperativecatalysis for highly enantioselective synthesis of δ-lactams is reported. The protocol allows the challenging remote γ-carbon control of regioselectivity and enantioselectivity through introduction of an appropriate γ-leaving group in the enals. The reaction offers good yields and excellent enantioselectivities
Small-Molecule Inhibitors of Protein Geranylgeranyltransferase Type I
作者:Sabrina Castellano、Hannah D. G. Fiji、Sape S. Kinderman、Masaru Watanabe、Pablo de Leon、Fuyuhiko Tamanoi、Ohyun Kwon
DOI:10.1021/ja070274n
日期:2007.5.1
Small molecules that inhibit the geranylgeranylation of K-Ras4B and RhoA by protein geranylgeranyltransferase type I (GGTase-I) were identified from chemical genetic screens of heterocycles synthesized through phosphine catalysis of allenes. To further improve the efficacy of the GGTase-I inhibitors (GGTIs), 4288 related compounds bearing core dihydropyrrole/pyrrolidine and tetrahydropyridine/piperidine scaffolds were synthesized on SynPhase lanterns in a split-pool manner through phosphine-catalyzed [3 + 2] and [4 + 2] annulations of resin-bound allenoates. Testing of the 4288 analogues resulted in several GGTIs exhibiting submicromolar IC50 values. Because proteins such as Ras and Rho GTPases are implicated in oncogenesis and metastasis, these GGTIs might ultimately lead to the development of novel antitumor therapeutics.