119463-16-0Relevant articles and documents
Molecular Iodine-Mediated α-C-H Oxidation of Pyrrolidines to N,O-Acetals: Synthesis of (±)-Preussin by Late-Stage 2,5-Difunctionalizations of Pyrrolidine
Rong, Hao-Jie,Yao, Jun-Jun,Li, Ji-Kun,Qu, Jin
, p. 5557 - 5565 (2017)
We previously reported an iterative synthesis of unsymmetrical 2,5-disubstituted pyrrolidines from pyrrolidine by two rounds of redox-triggered α-C-H functionalization. Although this approach can be used to introduce substituents at the 2- and 5-positions, it is lengthy because the redox auxiliary must be removed and then reinstalled. Therefore, we sought to develop a method to oxidize 2-functionalized pyrrolidine to cyclic N,O-acetal which could then react with a nucleophile for introduction of the 5-substituent. In this work, we found that molecular iodine can mediate the preferential oxidation of secondary over tertiary α-C-H bonds of α-substituted pyrrolidines to form cyclic N,O-acetals, improving the step economy of our previously reported method. With this strategy, (±)-preussin and its C(3) epimer were synthesized from (±)-pyrrolidin-3-ol.
Alkoxyallene-based syntheses of preussin and its analogs and their cytotoxicity
Hausherr, Arndt,Siemeister, Gerhard,Reissig, Hans-Ulrich
, p. 122 - 134 (2019)
Short syntheses of oxa-preussin, racemic preussin and (-)-preussin are reported. Starting from a racemic 3-nonyl-substituted methoxyallene derivative, its lithiation and addition to phenylethanal provided the corresponding allenyl alcohol that was converted into two diastereomeric dihydrofuran derivatives by silver nitrate-catalyzed 5-endo-trig cyclization. The acid hydrolysis of the enol ether moiety gave heterocyclic ketones and subsequent highly stereoselective reductions with l-selectride furnished 2-benzyl-5-nonylfuran-3-ol derivatives in good overall yield. The major all-cis-diastereomer has the skeleton and relative configuration of preussin and is hence called oxa-preussin. An analogous sequence with the same allene, but an N-sulfonyl imine as the electrophile, finally led to racemic preussin. The stereoselectivities of the individual steps are discussed in detail. With an enantiopure 2-benzyl-5-nonylpyrrolidin-3-one intermediate the preparation of (-)-preussin with an enantiomeric ratio of >95:5 could be accomplished in a few steps. The sign of the optical rotation of this product finally proved the absolute configurations of its precursors and demonstrated that our chiral auxiliary-based route led to the antipode of the natural product. The cytotoxicity of several of the prepared heterocycles against MCF-7 tumor cells was investigated and five compounds, including racemic and enantiopure (-)-preussin, were identified as highly cytotoxic with IC50 values in the range of 3-6 μM.
A concise and efficient synthesis of (+)-preussin
Arevalo-Garcia, Enzo B.
, p. 47 - 50 (2014)
A novel and efficient synthesis of (+)-preussin (7) starting from N-butoxycarbonyl-L-phenylalaninal (1) is described. This natural product was synthesized under mild conditions and with good overall yield.
An efficient approach to trans-4-hydroxy-5-substituted 2-pyrrolidinones through a stereoselective tandem Barbier process: divergent syntheses of (3R,4S)-statines, (+)-preussin and (?)-hapalosin
Si, Chang-Mei,Shao, Lu-Ping,Mao, Zhuo-Ya,Zhou, Wen,Wei, Bang-Guo
, p. 649 - 661 (2017/01/25)
A diastereoselective approach to trans-4-hydroxy-5-substituted 2-pyrrolidinones 1 (P1 = TBS, P2 = H) has been developed through a stereoselective tandem Barbier process of (R,SRS)-8 with alkyl and aryl bromide. The stereochemistry at the C-5 stereogenic center of the trans-4-hydroxy-5-substituted 2-pyrrolidinones was solely controlled by α-alkoxy substitution. This effective approach was successfully used to prepare a variety of substituted (3R,4S)-statines 2. In addition, two bioactive natural products of (+)-preussin 4 and hapalosin 5 were effectively synthesized through this stereoselective tandem Barbier process.
Asymmetric synthesis of 2,5-disubstituted 3-hydroxypyrrolidines based on stereodivergent intramolecular iridium-catalyzed allylic aminations
Natori, Yoshihiro,Kikuchi, Shunsuke,Kondo, Takahiro,Saito, Yukako,Yoshimura, Yuichi,Takahata, Hiroki
, p. 1983 - 1994 (2014/03/21)
Intramolecular iridium-catalyzed allylic aminations of homochiral (E)-6-N-nosylaminohept-2-en-1-yl methyl carbonates were investigated. The relative position of the 2,5-substituents of the resulting pyrrolidines was found to be controlled by using both enantiomers (4 and 5) of the appropriate chiral ligand, demonstrating a simple and highly stereodivergent synthetic protocol. Selected trans- and cis-2,5-disubstituted 3-hydroxypyrrolidines (2a and 18a) were converted to (+)-bulgecinine (6) and (+)-preussin (7), respectively.
Three-step synthesis of (±)-preussin from decanal
Rosset, Isac G.,Dias, Rafael M. P.,Pinho, Vagner D.,Burtoloso, Antonio C. B.
, p. 6748 - 6753 (2014/08/05)
A straightforward and stereoselective synthesis of the alkaloid preussin is described starting from decanal and diethyl 3-diazo-2-oxopropylphosphonate. The key steps are an aza-Michael reaction from an α,β-unsaturated diazoketone followed by a highly stereoselective Cu-catalyzed ylide formation and then a [1,2]-Stevens rearrangement. This strategy is feasible for extension to preussin analogues, demonstrating its utility for the rapid construction of all-cis-substituted pyrrolidines.
An efficient method for the preparation of 3-hydroxyl-5-substituted 2-pyrrolidones and application in the divergent synthesis of (-)-preussin and its analogues
Zhou, Qian-Ru,Wei, Xiao-Yun,Li, You-Qin,Huang, Danfeng,Wei, Bang-Guo
, p. 4799 - 4808 (2014/06/24)
An asymmetric method to (S,R)-α-hydroxyl-γ-amino alcohols 12 through a diastereoselective addition of Grignard reagents to β-chiral aldimines 11 is described. Subsequent oxidation/cyclization with Sarett reagent provided a novel approach to lactams 14, a flexible building block whose utility was demonstrated in the divergent synthesis of antifungal agent (-)-preussin 5 and its three analogues 23, 24, 25.
Versatile one-pot reductive alkylation of lactams/amides via amide activation: Application to the concise syntheses of bioactive alkaloids (±)-bgugaine, (±)-coniine, (+)-preussin, and (-)-cassine
Xiao, Kai-Jiong,Wang, Yu,Ye, Ke-Yin,Huang, Pei-Qiang
supporting information; experimental part, p. 12792 - 12796 (2011/02/22)
Direct entry: One-pot reductive alkylation of lactams/amides with Grignard reagents has been realized via lactam/amide activation with Tf2O. This method opens a direct entry to α-alkylated amines. The versatility of the method is illustrated by the concise syntheses of bioactive alkaloids (±)-bgugaine, (±)-coniine, (+)-preussin, and (?)-cassine.
A concise and stereoselective synthesis of hydroxypyrrolidines: Rapid synthesis of (+)-preussin
Draper, Jason A.,Britton, Robert
supporting information; experimental part, p. 4034 - 4037 (2010/11/05)
A convergent and stereoselective synthesis of 2,5-disubstituted 3-hydroxypyrrolidines has been developed that involves reductive annulation of β-iminochlorohydrins, which are readily available from β- ketochlorohydrins, and provides rapid access to a variety of 2,5-syn-pyrrolidines. Application of this process to the concise (three-step) synthesis of the fungal metabolite (+)-preussin and analogues of this substance is reported.
Asymmetric synthesis of cis- and trans-2,5-disubstituted pyrrolidines from 3-oxo pyrrolidine 2-phosphonates: Synthesis of (+)-preussin and analogs
Davis, Franklin A.,Zhang, Junyi,Qiu, Hui,Wu, Yongzhong
body text, p. 1433 - 1436 (2009/04/10)
(Chemical Equation Presented) Pyrrolidine enones, derived from 3-oxo pyrrolidine 2-phosphonates and a HWE reaction with aldehydes, on Luche reduction give pyrrolidine allylic alcohols. The alcohols on hydrogenation (Pd/H 2) give cis-2,5-disubstituted pyrrolidines and on treatment with TFA-NaBH3CN undergo a hydroxy directed reduction to trans-2,5-disubstituted pyrrolidines.
