Well-Defined Air-Stable Palladium HASPO Complexes for Efficient Kumada-Corriu Cross-Couplings of (Hetero)Aryl or Alkenyl Tosylates
作者:Lutz Ackermann、Anant R. Kapdi、Sabine Fenner、Christoph Kornhaaß、Carola Schulzke
DOI:10.1002/chem.201002386
日期:2011.3.1
Palladium complexes of representative heteroatom‐substituted secondary phosphine oxide (HASPO) preligands were synthesized and fully characterized, including X‐ray crystal structure analysis. Importantly, these well‐defined complexes served as highly efficientcatalysts for Kumada–Corriu cross‐couplingreactions of aryl, alkenyl, and even heteroaryl tosylates. Particularly, an air‐stable catalyst derived
代表的钯络合物ħ etero一汤姆取代小号econdary p hosphine ø西德(HASPO)preligands合成并充分表征,包括X射线晶体结构分析。重要的是,这些定义明确的络合物可作为Kumada-Corriu芳基,烯基乃至杂芳基甲苯磺酸酯交叉偶联反应的高效催化剂。特别是,由廉价的PinP(O)H衍生的空气稳定型催化剂显示出极高的催化效力,这导致在极低的反应条件下,在足够宽泛的反应条件下,低催化剂负载下的交叉偶联。
Pd-Catalyzed Cross-Coupling of Highly Sterically Congested Enol Carbamates with Grignard Reagents via C–O Bond Activation
作者:Zicong Chen、Chau Ming So
DOI:10.1021/acs.orglett.0c01127
日期:2020.5.15
The palladium-catalyzed cross-coupling reaction of enol carbamates to construct highly sterically congested alkenyl compounds is presented for the first time. This protocol demonstrates the potential of using thermally stable and highly atom-economic enol electrophiles as building blocks in bulky alkene synthesis. This reaction accommodates a broad substrate scope with excellent Z/E isomer ratios,
作者:Florine Lecerf-Schmidt、Romain Haudecoeur、Basile Peres、Marcos Marçal Ferreira Queiroz、Laurence Marcourt、Soura Challal、Emerson Ferreira Queiroz、Germain Sotoing Taiwe、Thierry Lomberget、Marc Le Borgne、Jean-Luc Wolfender、Michel De Waard、Richard J. Robins、Ahcène Boumendjel
DOI:10.1039/c5cc05948h
日期:——
The key step in the proposed biosynthesis of tramadol was achieved using mild biomimetic conditions.
在拟议的曲马多生物合成中,关键步骤是使用温和的仿生条件实现的。
Chem. Commun. 2015, 51, 14451-14453
作者:
DOI:——
日期:——
Synthesis of bridged 2-phenylcyclohexylamines as potential analgetics.
作者:HIROZUMI INOUE、IKUO IIJIMA、MIKIO TAKEDA
DOI:10.1248/cpb.28.1022
日期:——
9-Amino-1-(m-hydroxyphenyl) bicyclo [3. 3. 1] nonanes (Va) and their seven-membered homologs (Vb) were synthesized as potential analgetic agents. Condensation of acryloyl chloride with the morpholine enamine of the cyclohexanone (1a) gave the diketone (4a). Ketalization of 4a followed by Wolff-Kishner reduction gave the 9-oxo derivative (11), which was converted to the 9-amino derivative (16) via the oxime (12). Condensation of acryloyl chloride and the morpholine enamine of the cycloheptanone (1b) gave the imminium salt (3b). Reaction of 3b with NH2OH occurred regiospecifically to give the 9-oxo-10-oxime (19). The oxime (19) was ultimately converted to the 10-amino derivative (27) via the amino-alcohol (21). LiAlH4 reduction of the 10-endo-ethoxycarbamoyl derivative (25) and its 9-hydroxy derivative (23) anomalously gave epimeric mixtures of the 10-methylamino derivatives. From the primary amines 16 and 27, various N-substituted derivatives were prepared for pharmacological evaluation. None showed significant activity.