Copper-Catalyzed Asymmetric Propargylation of Cyclic Aldimines
作者:Daniel R. Fandrick、Christine A. Hart、Ifeanyi S. Okafor、Michael A. Mercadante、Sanjit Sanyal、James T. Masters、Max Sarvestani、Keith R. Fandrick、Jennifer L. Stockdill、Nelu Grinberg、Nina Gonnella、Heewon Lee、Chris H. Senanayake
DOI:10.1021/acs.orglett.6b03253
日期:2016.12.2
The copper-catalyzedasymmetric propargylation of cyclic aldimines is reported. The influence of the imine trimer to inhibit the reaction was identified, and equilibrium constants between the monomer and trimer were determined for general classes of imines. Asymmetric propargylation of a diverse series of N-alkyl and N-aryl aldimines was achieved with good to high asymmetric induction. The utility
Auxiliary silicon in regioselective cobalt catalyzed protoberberine syntheses
作者:Russell L. Hillard、Carol A. Parnell、K.Peter C. Vollhardt
DOI:10.1016/s0040-4020(01)88589-6
日期:1983.1
η5-Cyclopentadienyl dicarbonyl cobalt catalyzes the cocyclization of 1,2-bis(propargyl)-1,2,3,4-tetrahydroisoquinolines 4b and 5 with alkynes to provide a novel synthetic entry into the tetrahydroprotoberberine nucleus. By judicious choice of trimethylsilyl substituents, regiocontrol in the D-ring can be achieved. Reaction of 4b with benzonitrile in the presence of the catalyst furnishes the rare isoquino[2
η 5 -环戊二烯基二羰基钴催化的1,2-双(炔丙基)-1,2,3,4-四氢异喹啉的cocyclization 4B和5与炔烃是提供一种新颖的合成进入tetrahydroprotoberberine细胞核。通过明智地选择三甲基甲硅烷基取代基,可以实现D环中的区域控制。的反应4B与在催化剂的存在下苄腈配料的稀土异奎诺[2,1- b ] -2,6-萘啶骨架,也区域选择性。
A novel pyrrole synthesis
作者:Sameer Agarwal、Hans-Joachim Knölker
DOI:10.1039/b412206b
日期:——
The silver(I)-promoted oxidative cyclization of homopropargylamines at room temperature provides a novel access to pyrroles. Homopropargylamines are readily available by the addition of a propargyl Grignard reagent to Schiff bases.
Total synthesis of the antitumor active pyrrolo[2,1-a]isoquinoline alkaloid (±)-crispine A
作者:Hans-Joachim Knölker、Sameer Agarwal
DOI:10.1016/j.tetlet.2004.12.066
日期:2005.2
4-dihydro-6,7-dimethoxyisoquinoline, silver(I)-promoted oxidative cyclization, and chemoselective hydrogenation of the pyrrole ring provide a simple three-step route to the antitumor active pyrrolo[2,1-a]isoquinoline alkaloid (±)-crispine A.