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Yan T, Babu KR, Wu Y, Li Y, Tang Y, Xu S. Phosphine-Catalyzed Cross-Coupling of Benzyl Halides and Fumarates. Org Lett 2021; 23:4570-4574. [PMID: 34048251 DOI: 10.1021/acs.orglett.1c01214] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A phosphine-catalyzed olefinic cross-coupling between benzyl halides and fumarates is described, which affords trisubstituted alkenes in good yields and excellent E-selectivity under metal-free conditions. Mechanistic studies suggest a catalytic cycle involving phosphorus ylide formation, Michael addition, water-assisted hydrogen transfer, and phosphine elimination.
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Affiliation(s)
- Tingting Yan
- School of Chemistry and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Kaki Raveendra Babu
- School of Chemistry and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Yong Wu
- School of Chemistry and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Yang Li
- School of Chemistry and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Yuhai Tang
- School of Chemistry and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Silong Xu
- School of Chemistry and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China
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Babu KR, Li Y, Xu W, Tang Y, Zhang W, Xu S. Multicomponent benzannulation of allylic P-ylides with isocyanates or aldehydes for construction of anilines and biaryls. Chem Commun (Camb) 2020; 56:8865-8868. [PMID: 32638748 DOI: 10.1039/d0cc03461d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The reactivity of allylic phosphorus ylides generated in situ from alkoxycarbonylmethylenephosphoranes and propiolates is investigated toward isocyanates and aromatic aldehydes, which leads to one-pot multicomponent benzannulations for efficient synthesis of polysubstituted anilines and biaryls, respectively. The mechanism may involve a tandem [2+2] cycloaddition/fragmentation/Wittig/cyclization/elimination/aromatization sequence.
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Affiliation(s)
- Kaki Raveendra Babu
- School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, and Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Yang Li
- School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, and Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Wenbo Xu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, P. R. China.
| | - Yuhai Tang
- School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, and Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Wenquan Zhang
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang 621900, P. R. China.
| | - Silong Xu
- School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, and Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
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Babu KR, Han W, Chen JB, Li Y, Tang Y, Zhang W, Xu W, Xu S. A three-component reaction of phosphorus ylides with isocyanates: facile synthesis of 2-amino-3-carboxylate-4-quinolones. Chem Commun (Camb) 2020; 56:5909-5912. [PMID: 32342091 DOI: 10.1039/d0cc01401j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A three-component reaction between one molecule of phosphorus ylides (P-ylides) and two molecules of isocyanates for the rapid assembly of 2-amino-3-carboxylate-4-quinolones is described. The mechanism may involve the addition of a P-ylide to an isocyanate followed by 1,3-H shift to form a carbamoyl stabilized P-ylide. The intermediate then reacts with another aryl isocyanate via Wittig/ketenimine-ketene rearrangement/6π-electrocyclization/1,3-H shift to finally afford the 4-quinolones.
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Affiliation(s)
- Kaki Raveendra Babu
- Department of Chemistry, School of Science, and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Wendan Han
- Department of Chemistry, School of Science, and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Jian-Bo Chen
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang 621900, P. R. China
| | - Yang Li
- Department of Chemistry, School of Science, and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Yuhai Tang
- Department of Chemistry, School of Science, and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Wenquan Zhang
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang 621900, P. R. China
| | - Wenbo Xu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, P. R. China.
| | - Silong Xu
- Department of Chemistry, School of Science, and Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
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Panday SK. Advances in the Mitsunobu Reaction: An Excellent Organic Protocol with Versatile Applications. MINI-REV ORG CHEM 2019. [DOI: 10.2174/1570193x15666180612090313] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The beginning of 1970’s may well be regarded as turning point in the area of organic synthesis
when an efficient and straight forward strategy for the reaction of primary and/or secondary alcohols
with variety of nucleophiles in the presence of triphenylphosphine and azodicarboxylate reagent was
discovered by O. Mitsunobu and since then rapid progress has been made in understanding and applying
the Mitsunobu reaction for various derivatization reactions. Due to versatile applications and mild reaction
conditions associated with the said strategy, the Mitsunobu reaction has received much attention in
the last almost fifty years and has been well reported. The basic objective of this review is to pay attention
on the recent advances and applications of the Mitsunobu reaction particularly in last decade. The
attention has also been paid to describe various modifications which have been explored in the traditional
Mitsunobu reaction by substituting P (III) reagents or azodicarboxylate reagents with other suitable
reagents or else using an organocatalyst with the objective to improve upon the traditional Mitsunobu
reaction. In the present review we wish to report the major advancements achieved in last few years
which are likely to be beneficial for the researchers across the globe.
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Affiliation(s)
- Sharad Kumar Panday
- Department of Applied Chemistry, Faculty of Engineering & Technology, M.J.P. Rohilkhand University, Bareilly-243 006, U.P, India
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Hemelaere R, Carreaux F, Carboni B. A Diastereoselective Route totrans-2-Aryl-2,3-dihydrobenzofurans through Sequential Cross-Metathesis/Isomerization/Allylboration Reactions: Synthesis of Bioactive Neolignans. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500019] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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