Regioselective Alkylation of Lithium Dienediolates of α,β-Unsaturated Carboxylic Acids
作者:Eva M. Brun、Salvador Gil、Ramón Mestres、Margarita Parra
DOI:10.1055/s-2000-6323
日期:——
Lithium carboxylic acids dienediolates are regioselectively alkylated at the α-carbon by reaction with tosylates derived from both primary and secondary alcohols. Both regio- and diastereoselectivity are improved when compared with those obtained in the corresponding alkylation with alkyl halides.
Decomposition of t-butyl erythro- and threo-2,3-diphenylperoxybutyrate was examined in solution at 60 °C; there was no indication of induced decomposition taking place as is the case with t-butyl 2,3-diphenylperoxypropionate. Various hydrocarbons resulting from the reaction of the 1,2-diphenylpropyl radical in a variety of ways were identified in the product, and t-butyl 1,2-diphenylpropyl ether was
在 60 °C 的溶液中检测叔丁基赤-和苏-2,3-二苯基过氧丁酸酯的分解;没有发生诱导分解的迹象,如使用 2,3-二苯基过氧丙酸叔丁酯的情况。在产物中鉴定出 1,2-二苯丙基自由基以多种方式反应产生的各种烃,并发现叔丁基 1,2-二苯丙基醚在苏/赤异构体中形成笼式重组产物比例取决于起始过丁酸酯的立体化学。
Catalytic asymmetric hydrogenation of β-disubstituted α-phenylacrylic acids asymmetric synthesis of carboxylic acids containing two vicinal chiral carbon centers
作者:Tamio Hayashi、Norio Kawamura、Yoshihiko Ito
DOI:10.1016/s0040-4039(00)82242-x
日期:1988.1
Hydrogenation of trisubstitutedacrylicacids (()- and ()MeC(R)CPhCOOH: R = CD3, Et, Ph) in the presence of a chiral (aminoalkyl)ferrocenylphosphine-rhodium catalyst installed asymmetric configurations at two vicinal carbons at once giving optically active carboxylic acids of high enantiomeric purities (80% ee).
三取代丙烯酸(()-和()MeC(R)aCPhCOOH:R = CD 3,Et,Ph)在手性(氨基烷基)二茂铁基膦-铑催化剂存在下,在两个邻位碳上以不对称构型存在下进行氢化一次得到高对映体纯度(80%ee)的光学活性羧酸。
Five- vs. Six-membered Ring Formation in Acid-catalyzed Cyclizations. II. 3,4-Diphenylvaleric Acid and 2,3-Diphenylglutaric Acid<sup>1,2</sup>
作者:Daniel Lednicer、Charles R. Hauser
DOI:10.1021/ja01556a050
日期:1958.12
The Synthesis of Tricyclic Hydrocarbons Related to Stilbestrol