338945-22-5Relevant articles and documents
A Bifunctional B,N-Based Asymmetric Catalytic Nitrostyrene-Michael Addition Acting through a 10-Membered Ring Cyclic Transition State
Du, Yihao,Erdem, Safiye S.,Sari, Ozlem,Whiting, Andrew
, (2021/11/17)
The B,N-bifunctional catalyst homoboroproline has been applied to a catalytic asymmetric nitroalkene-Michael addition to β-nitrostyrene analogues, showing broad substrate tolerance, high conversions and moderate to good asymmetric induction. The ability o
Sequential deprotectionecyclisation reaction: Stereoselective synthesis of azabicyclic β-enamino ester derivatives and (-) indolizidine 209D
Ponpandian, Thanasekaran,Muthusubramanian, Shanmugam
, p. 527 - 536 (2013/07/27)
This paper describes a new strategy for the stereoselective synthesis of pyrrolizidine and indolizidine based enamino esters and their acyl derivatives from L-proline. The key reaction in this process involves deprotection followed by ring closure of cyclic N-Boc amino-β-ketoesters. Also, the synthesis of 5R,9R- (-)-indolizidine 209D has been accomplished using this protocol.
Cobalt-catalyzed carbon-carbon bond formation: Synthesis and applications of enantiopure pyrrolidine derivatives[1]
Hsu, Shih-Fan,Ko, Chih-Wei,Wu, Yao-Ting
, p. 1756 - 1762 (2011/09/20)
In the presence of cobalt catalysts and tetramethylethylenediamine (TMEDA), the iodine atom in (S)-2-(iodomethyl)pyrrolidines was replaced by an aryl or an alkynyl group from the corresponding Grignard reagent, and the coupling products were obtained in good to excellent yields (16 examples; 75-94% yields). The scope and limitations of this protocol were examined. The stereochemistry of the pyrrolidines was unaffected by the reaction conditions. The coupling products are important building blocks of phenanthroindolizidine alkaloids. Palladium-catalyzed formal [4+2] cycloaddition of 2,2′-diiodobiphenyl with the thus-generated (S)-2-(3-trimethylsilyl-2-propynyl)pyrrolidine gave a good yield of the desilylated phenanthrene, which was then converted into unnatural (+)-(S)-tylophorine by the Pictet-Spengler cyclization. Copyright