Site-Selective γ-C(sp<sup>3</sup>)−H and γ-C(sp<sup>2</sup>)−H Arylation of Free Amino Esters Promoted by a Catalytic Transient Directing Group
作者:Hua Lin、Chao Wang、Thomas D. Bannister、Theodore M. Kamenecka
DOI:10.1002/chem.201802465
日期:2018.7.5
The first selective PdII‐catalysed γ‐C(sp3)−H and γ‐C(sp2)−H arylation of free amino esters using a commercially available catalytic transient directing group. A variety of free amino esters, including α‐amino esters and β‐amino esters, amino monoesters and amino bis‐esters, are shown to react with a diverse range of simple aryl and heteroaryl iodide reagents.
Studies on Optically Active Amino Acids. VIII. Studies on α-Alkyl-α-amino Acids. III. Determination of Absolute Configuration of Optically Active Isovaline.
作者:Kazuo Achiwa、Shun-ichi Yamada
DOI:10.1248/cpb.14.537
日期:——
The absolute configuration of (+)-isovaline ((+)-VIII) was correlated with D-(-)-quinic acid ((-)-XI) by leading to (+)-5-ethyl-5-methyl-2-pyrrolidinone ((+)-XXIX-A and B) from (+)-isovaline and D-(-)-quinic acid. It was recommended that (+)-isovaline should be shown by the formula IX or X, that is, S(+)-isovaline. The solvent effects on ORD curves of (+)-XXXI were also observed.
(+)-isovaline ((+)-VIII) 的绝对构型与 D-(-)-奎宁酸 ((-)-XI)相关,由 (+)-isovaline 和 D-(-)-奎宁酸生成 (+)-5-ethyl-5-methyl-2-pyrrolidinone ((+)-XXIX-A 和 B)。建议用式 IX 或 X 表示(+)-异戊烯,即 S(+)-异戊烯。还观察了溶剂对 (+)-XXXI 的 ORD 曲线的影响。
Ihara, Masataka; Takahashi, Masanobu; Taniguchi, Nobuaki, Journal of the Chemical Society. Perkin transactions I, 1991, # 3, p. 525 - 535