| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Research Abstract |
1) We achieved the chirality exchange benzannulation from sp3 central chirality to axial chirality, and obtained axially chiral 1-arylnaphthalenes with excellent enantioselectivity. Total synthesis of optically active Procunphthalide was demonstrated by using the chirality exchange benzannulation. 2) A novel ring-expansion of methyl (arylhydroxymethyl)- cyclopropanecarboxylates using Sc(OTf)3 or BF3 afforded 1,2-dihydronaphthalene-3-carboxylic acid ester in high to excellent yields. In the reaction, highly regioselective ring opening of cyclopropane and sequential cyclization occurred. Total synthesis of cyclogalgravin and its dicarboxyl analog was demonstrated by using the SmI2- promoted Reformatsky-type reaction and the Sc(OTf)3-mediated diasteroselective ring expansion as key steps. This method includes a novel transformation of two C-Cl bonds of gem- dichlolocyclopropane to two C-C bonds.
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