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71.
Kenji Mori Masanao Matsui Yusuke Sumiki 《Bioscience, biotechnology, and biochemistry》2013,77(3):205-222
In order to clarify the structure of ring A of gibberellins, thirteen lactones of cyclohexan series, of which eight were new, were prepared to examine their infrared spectra. So far; the experiment is concerned, γ-lactones show the characteristic absorption band in the rang 1775~1782 cm?1 in dioxane, while 5-ones in the range 1730/~1762 cm?1. Since the absorptio band due to lactone carbonyl of gibberellins occurs at the range 1777~1786 cm?1 in dioxane, the lactone ring of gibberellins seems to be γ. 相似文献
72.
The 2,3-Dihydro-lH-pyrrolo[l,2-a]indole ring system was synthesised by the condensation reaction of toluquinone and 2-cyanomethylenepyrrolidine. 相似文献
73.
Susumu Murata Hirokazu Matsui Seiya Chiba Tokuji Shimomura 《Bioscience, biotechnology, and biochemistry》2013,77(10):2131-2135
The substrate specificity of rice α-glucosidase II was studied. The enzyme was active especially on nigerose, phenyl-α-maltoside and maltooligosaccharides. The actions on isomaltose and phenyl-α-glucoside were weak, and on sucrose and methyl-α-glucoside, negligible. The α-glucans, such as soluble starch, amylopectin, β-limit dextrin, glycogen and amylose, were also hydrolyzed.The ratio of the maximum velocities for hydrolyses of maltose (G2), nigerose (N), kojibiose (K), isomaltose (I), phenyl-α-maltoside (?M) and soluble starch (SS) was estimated to be 100: 94.4: 14.2: 7.1: 89.5: 103.1 in this order, and that for hydrolyses of malto-triose (G3), -tetraose (G4), -pentaose (G5), -hexaose (G6), -heptaose (G7), -octaose (G8), and amyloses ( and ), 113: 113: 113: 106: 113: 100: 106: 106. The Km values for N, K, I, ?M and SS were 2.4 mm, 0.58 mm, 20 mm, 1.6 mm and 5.0 mg/ml, respectively; those for G2, G3, G4, G5, G6, G7, G8, and , 2.4 mm, 2.2 mm, 2.1 mm, 1.5 mm, 1.0 mm, 1.1 mm, 0.95 mm, 1.5 mm and 1.1 mm.Rice α-glucosidase II is considered an enzyme with a preferential activity on maltooligosaccharides. 相似文献
74.
Masateru Miyano Akio Kobayashi Masanao Matsui 《Bioscience, biotechnology, and biochemistry》2013,77(9):673-677
d,l-Derrisic acid (IIa, R′: H) was synthesized from d,l-hydroxy dihydrotubanol (Ve) by Hoesch condensation with a nitrile (VI). The possible optical resolution of d,l-IIa was demonstrated by a conventional “reversed resolution” method.This communication and previous works constitute the first total synthesis of natural rotenone (Ia). 相似文献
75.
The structure of a minor component in the oxidation products of crude natural variotin oxidized with manganese dioxide is elucidated. The synthesis of the investigated compound, N-(6-oxo-2,4-trans, tralls-heptadienoyl) 2-pyrrolidonide, and the reduction of the substance are also described. 相似文献
76.
Hiroyasu Koyama Katsura Kogure Kenji Mori Masanao Matsui 《Bioscience, biotechnology, and biochemistry》2013,77(4):915-920
Antimycinone A3, which is a neutral fragment of mild alkaline hydrolysate of antimycin A3, and its stereoisomers were synthesized stereoselectively from methyl trans-2-n-butylpent-3-enoate or methyl cis-2-n-butylpent-3-enoate, and natural antimycinone A3 was proved to possess Hα-Hβ and Hβ-Hγ trans configuration. 相似文献
77.
So called ambreinolal (IV),* a component of ambergris, was first synthesized by CrO3 oxidation of ambreinolol (III)* which was obtained from ambreinolide (II) by reduction with LiAlH4. Ambreinolol (III) was converted to the C17-saturated oxide (VII) in a good yield through the monotosylate (VIII) by treatment with p-toluenesulfonyl chloride in pyridine.Ambrein (I), a major constituent of ambergris, was easily converted to ambrein-tetrahydropyranylether (II), of which thermal decomposition gave back ambrein (I). The tetrahydropyranylether (II) was oxidized to ambreinolal-tetrahydropyranylether (V) in two steps. Ambreinolal-tetrahydropyranylether (V) was synthesized from ambreinolol (VII) in four steps and converted to the C17-unsaturated oxide (VI) on heating. 相似文献
78.
79.
Masayuki Sakakibara Masanao Matsui 《Bioscience, biotechnology, and biochemistry》2013,77(5):1131-1137
The syntheses of three dl-demethylvariotins are described. 相似文献
80.
Minoru Yoshida Hiroshi Morimoto Masanao Matsui Ryohei Oda 《Bioscience, biotechnology, and biochemistry》2013,77(9):1308-1313
Biological availability of 23 alcohols, 16 aldehydes and 2 ketones was compared by the mini-test with chicks. Chicks can utilize methanol and ethanol, but not the alcohols of carbon chain from 3 to 9. Lauryl and myristyl alcohols were well utilized but those of higher carbon chain than 14 were not, mainly due to low digestibility. Glycerol and D-sorbitol were well utilized but not 4 other poly alcohols tested. Aldehydes and ketones with free carbonyl group showed low availability or even toxicity, but their derivatives with masked group showed no detrimental effect. Acetaldehyde, acetal and aldehydes of carbon chain longer than 9 were partially utilized. 相似文献