Synthesis of fully functionalized aglycone of lycoperdinoside A and B

2015 ◽  
Vol 13 (1) ◽  
pp. 115-124 ◽  
Author(s):  
Balla Chandrasekhar ◽  
Sudhakar Athe ◽  
P. Purushotham Reddy ◽  
Subhash Ghosh
Keyword(s):  
Cross Coupling ◽  
Aldol Reactions ◽  
Key Steps

Synthesis of fully functionalized aglycone of lycoperdinoside A and B is achieved via Pd-catalyzed Stille–Migita cross coupling and Evans syn- and anti aldol reactions as key steps.

A Short Synthesis of the Plant Alkaloid 4-Methyl-2,6-naphthyridine

2019 ◽  
Vol 16 (12) ◽  
pp. 931-934 ◽  
Author(s):  
Alexandra Kamlah ◽  
Franz Bracher
Keyword(s):  
Pyridine Ring ◽  
Cross Coupling ◽  
Antirrhinum Majus ◽  
New Synthesis ◽  
Short Synthesis ◽  
Regioselective Oxidation ◽  
Key Steps

: A new synthesis of the 2,6-naphthyridine alkaloid 4-methyl-2,6-naphthyridine from Antirrhinum majus has been developed. Key steps are a regioselective oxidation of 3-bromo-4,5- dimethylpyridine to the corresponding 4-formyl derivative, and the annulation of the second pyridine ring by Suzuki-Miyaura cross-coupling using (E)-2-ethoxyvinylboronic acid pinacol ester as a masked acetaldehyde equivalent. This protocol gives the alkaloid in four steps starting from commercially available 3,4-dimethylpyridine in 15% overall yield. This annulation protocol should be useful for the synthesis of other condensed pyridines as well.

Synthesis of Biaryl Derivatives by Using Ruthenium-Mediated [2+2+2] Cyclotrimerization and Suzuki-Miyaura Cross-Coupling as Key Steps

Synthesis ◽  
2011 ◽  
Vol 2011 (10) ◽  
pp. 1581-1586 ◽  
Author(s):  
Sambasivarao Kotha ◽  
Vittal Seema ◽  
Shaikh Mobin
Keyword(s):  
Cross Coupling ◽  
Key Steps

A Concise Enantioselective Synthesis of (S)-Preclamol via Asymmetric Catalytic Negishi Cross-Coupling Reaction

Synlett ◽  
2019 ◽  
Vol 30 (07) ◽  
pp. 860-862 ◽  
Author(s):  
Yun Zhou ◽  
Chunxiao Liu ◽  
Lifeng Wang ◽  
Leng Han ◽  
Shicong Hou ◽  
...  
Keyword(s):  
Total Yield ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Enantioselective Synthesis ◽  
Synthetic Approach ◽  
Chiral Drugs ◽  
Asymmetric Catalytic ◽  
Cross Coupling Reaction ◽  
Tertiary Carbon ◽  
Key Steps

A novel, concise, and efficient enantioselective synthesis of (S)-preclamol (87% ee, 51% total yield) has been developed. The key steps of this synthetic approach included cobalt-catalyzed asymmetric catalytic cross-coupling of α-bromo ester with arylzinc and the reduction of chiral ester to diol with a tertiary carbon atom. Moreover, it was demonstrated that our enantioselective Negishi cross-coupling was a powerful tool to construct stereogenic benzylmethyl center in chiral drugs on a gram scale.

scholarly journals An enantioselective synthesis of the C24–C40 fragment of (−)-pulvomycin

2014 ◽  
Vol 50 (38) ◽  
pp. 4901-4903 ◽  
Author(s):  
Sandra Börding ◽  
Thorsten Bach
Keyword(s):  
Synthesis Method ◽  
Cross Coupling ◽  
Enantioselective Synthesis ◽  
Pure Form ◽  
Enantiomerically Pure ◽  
Diastereoselective Addition ◽  
Key Steps

The C24–C40 fragment of (−)-pulvomycin was prepared in enantiomerically pure form using a concise synthesis method (15 linear steps from d-fucose, 6.8% overall yield) featuring a diastereoselective addition to an aldehyde, a β-selective glycosylation and a Stille cross-coupling as the key steps.

scholarly journals Total Synthesis of Surinamensinols A and B

SynOpen ◽  
2020 ◽  
Vol 04 (04) ◽  
pp. 84-88
Author(s):  
Ahmed Al-Harrasi ◽  
Satya Kumar Avula ◽  
Biswanath Das ◽  
Rene Csuk ◽  
Ahmed Al-Rawahi
Keyword(s):  
Total Synthesis ◽  
Allyl Alcohol ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Ethyl Lactate ◽  
Naturally Occurring ◽  
Cross Coupling Reaction ◽  
Synthetic Sequence ◽  
Key Steps ◽  
Single Approach

AbstractAn efficient total synthesis of the naturally occurring anti-inflammatory and antitumour 8-O-4′-neolignans, surinamensinols A and B, has been accomplished from commercially available allyl alcohol and (S)-ethyl lactate. The synthetic sequence involves a palladium-catalysed Suzuki–Miyaura cross-coupling reaction followed by a chiral Mitsunobu­ reaction as the key steps. This is the first report of the simultaneous stereoselective total synthesis of surinamensinols A and B through a single approach involving only six steps.

scholarly journals Synergistic approach to polycycles through Suzuki–Miyaura cross coupling and metathesis as key steps

2018 ◽  
Vol 14 ◽  
pp. 2468-2481 ◽  
Author(s):  
Sambasivarao Kotha ◽  
Milind Meshram ◽  
Chandravathi Chakkapalli
Keyword(s):  
Recent Work ◽  
Claisen Rearrangement ◽  
Cross Coupling ◽  
Alder Reaction ◽  
Diels Alder ◽  
Enyne Metathesis ◽  
Cross Metathesis ◽  
Diels Alder Reaction ◽  
Synergistic Approach ◽  
Key Steps

This account provides an overview of recent work, including our own contribution dealing with Suzuki–Miyaura cross coupling in combination with metathesis (or vice-versa). Several cyclophanes, polycycles, macrocycles, spirocycles, stilbenes, biaryls, and heterocycles have been synthesized by employing a combination of Suzuki cross-coupling and metathesis. Various popular reactions such as Diels–Alder reaction, Claisen rearrangement, cross-metathesis, and cross-enyne metathesis are used. The synergistic combination of these powerful reactions is found to be useful for the construction of complex targets and fulfill synthetic brevity.

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