R
Ryohei Nagase
Researcher at Kwansei Gakuin University
Publications - 30
Citations - 369
Ryohei Nagase is an academic researcher from Kwansei Gakuin University. The author has contributed to research in topics: Claisen condensation & Aldol reaction. The author has an hindex of 11, co-authored 30 publications receiving 348 citations. Previous affiliations of Ryohei Nagase include Shinshu University.
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Ti-Crossed-Claisen Condensation between Carboxylic Esters and Acid Chlorides or Acids: A Highly Selective and General Method for the Preparation of Various β-Keto Esters
TL;DR: Ti-crossed-Claisen condensation between a 1:1 mixture of carboxylic esters and acid chlorides promoted by TiCl4-Bu3N-N-methylimidazole proceeded successfully to give various beta-keto esters in good yields with excellent selectivities.
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Mild and efficient pentafluorophenylammonium triflate (PFPAT)-catalyzed C-acylations of enol silyl ethers or ketene silyl (Thio)acetals with acid chlorides.
TL;DR: A pentafluorophenylammonium triflate (PFPAT) catalyst successfully promoted C-acylation of enol silyl ethers with acid chloride to produce various beta-diketones and proceeded smoothly to provide alpha-monoalkylated beta-keto (thio)esters in good to excellent yield.
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Synthesis of the seed germination stimulant 3-methyl-2H-furo[2,3-c]pyran-2-ones utilizing direct and regioselective Ti-crossed aldol addition
TL;DR: In this paper, a seed germination stimulant was synthesized using direct and regioselective Ti-crossed aldol addition between dihydro-2 H -pyran-3(4 H )-ones and methyl pyruvate as the key step.
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Ti-direct, powerful, stereoselective aldol-type additions of esters and thioesters to carbonyl compounds: application to the synthesis and evaluation of lactone analogs of jasmone perfumes
Ryohei Nagase,Noriaki Matsumoto,Kohei Hosomi,Takahiro Higashi,Syunsuke Funakoshi,Tomonori Misaki,Yoo Tanabe +6 more
TL;DR: Using the present reaction as the key step, an efficient short synthesis of three lactone [2(5H)-furanone] analogs of jasmine perfumes was performed, and the lactone analog of cis-jasmone had a unique perfume property (tabac).
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Highly Stereoselective Radical Carbonylations of gem-Dihalocyclopropane Derivatives with CO
Yoshinori Nishii,Takao Nagano,Hideki Gotoh,Ryohei Nagase,Jiro Motoyoshiya,Hiromu Aoyama,Yoo Tanabe +6 more
TL;DR: A couple of radical carbonylations of gem-dihalocyclopropanes 1 using CO and Bu3SnH (formylation) or Bu3 Sn(CH2CH=CH2) (allylacylation) successfully proceeded to give trans and cis adducts with good to excellent stereoselectivity.