Výsledky vyhledávání - "Bao‐Zhong Zheng"

Akademický článek

Development of 3-methoxy-4-benzyloxybenzyl alcohol (MBBA) resin as polymer-supported synthesis support: Preparation and benzyl ether cleavage by DDQ oxidation.

Autor: Qiang Huang¹ huangqiang@ynu.edu.cn, Bao-Zhong Zheng¹, Quan Long²

Publikováno v: Journal of Chemical Sciences. Mar2010, Vol. 122 Issue 2, p203-207. 5p. 1 Chart.

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Development of 3-methoxy-4-benzyloxybenzyl alcohol (MBBA) resin as polymer-supported synthesis support: Preparation and benzyl ether cleavage by DDQ oxidation

Autor: Bao-Zhong Zheng, Quan Long, Qiang Huang

Publikováno v: Journal of Chemical Sciences. 122:203-207

3-Methoxy-4-benzyloxybenzyl alcohol (MBBA) resin was synthesized by a two-step sequence under microwave irradiation involving the reaction of commercially available Merrifield resin with vanillin, followed by reduction with sodium borohydride. MBBA r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8dd5b90a837e21108a8ffa269e7d4430
https://doi.org/10.1007/s12039-010-0023-x

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Facile chelation-controlled reductive opening of methoxybenzylidene acetals with Bu3SnH and MgBr2. Regioselective protection strategy as MPM ethers

Autor: Hiroo Dei, Osamu Yonemitsu, Megumi Yamauchi, Shin-ichi Kusaka, Bao‐Zhong Zheng, Katsuya Matsui

Publikováno v: Tetrahedron Letters. 41:6441-6445

A mild and efficient regioselective reductive opening of methoxybenzylidene acetals using a combination of Bu 3 SnH and MgBr 2 ·OEt 2 , mainly via five-membered chelation intermediates is described. This reaction was applied to synthetic intermediat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a5089b8eb1af8386e58d06116810aab
https://doi.org/10.1016/s0040-4039(00)01017-0

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Synthetic Studies of an 18-Membered Antitumor Macrolide, Tedanolide. 6. Synthesis of a Key Intermediate via a Highly Efficient Macrolactonization of Computer-Aid Designed Seco-Acid

Autor: Noriyuki Nakajima, Osamu Yonemitsu, Bao-Zhong Zheng, Tomohiro Matsushima

Publikováno v: Chemical and Pharmaceutical Bulletin. 48:855-860

A stereoselective synthesis is described of the 18-membered lactone (2) via an efficient macrolactonization of the conformation-controlled seco-acid (3); this was designed with the aid of molecular mechanics (MM)-calculation and synthesized by coupli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb388c2002698a71c3deb9261dcfed1c
https://doi.org/10.1248/cpb.48.855

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Studies on the Synthesis of Myriaporones: Stereoselective Synthesis of the C5-C13 Fragment Starting from D-Glucose via Regioselective Reductive Opening of Methoxybenzylidene Acetal

Autor: Hiroo Dei, Bao‐Zhong Zheng, Megumi Yamauchi, Osamu Yonemitsu

Publikováno v: Chemical and Pharmaceutical Bulletin. 48:1761-1765

A stereoselective synthesis is described of the C5-C13 fragment (4) of myriaporone 4 (1) starting from D-glucose by a coupling of the C5-C9 aldehyde (5), prepared using a regioselective reductive ring-opening of methoxybenzylidene acetal, with the C1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6cf8fcc5483610cb8abac6adac30efa1
https://doi.org/10.1248/cpb.48.1761

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Synthetic Studies of an 18-Membered Antitumor Macrolide, Tedanolide. 5. Stereoselective Synthesis of the C13-C23 Part via Condensation of Two Fragments, C13-C17 and C18-C21, by Taking Advantage of the 3,4-Dimethoxybenzyl Protecting Group

Autor: Jun'ichi Uenishi, Tomohiro Matsushima, Hiroshi Maeda, Noriyuki Nakajima, Bao-Zhong Zheng, Shin-ichi Kusaka, Michiko Mori, Osamu Yonemitsu

Publikováno v: Chemical and Pharmaceutical Bulletin. 47:1288-1296

An efficient and stereoselective synthesis of the C13-C23 part (8) was achieved starting from methyl (R)- and (S)-3-hydroxy-2-methylpropionates (9) via coupling of the C13-C17 aldehyde (6), prepared by Evans asymmetric aldol reaction, with the C18-C2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02ebe4c9328c4d018c383f2a4dde813f
https://doi.org/10.1248/cpb.47.1288

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Tandem Beckmann and Huisgen–White rearrangement as an alternative to the Baeyer–Villiger oxidation of the bicyclo[3.3.1]nonane system: first asymmetric synthesis of (–)-dihydropalustramic acid. X-Ray molecular structure of 2β-ethyl-9-phenylsulfonyl-9-azabicyclo[3.3.1]nonan-3-one

Autor: Conrad Hans Eugster, Genzoh Tanabe, Osamu Muraoka, Takefumi Momose, Bao-Zhong Zheng, Kazuhito Okumura

Publikováno v: J. Chem. Soc., Perkin Trans. 1. :1567-1575

The transformation of the ‘fork head ketone’ 3b into the corresponding bicyclic lactone 13 via the Beckmann followed by the Huisgen–White rearrangement is described. Application of the method to a homochiral 2-etyl-substituted bicyclic ketone (

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::563c535d69463c0bce9862e790302a0a
https://doi.org/10.1039/p19960001567

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Enantioselective total synthesis of the di-O-methyl ethers of (–)-agatharesinol, (+)-hinokiresinol and (–)-sugiresinol, characteristic norlignans of Coniferae

Autor: Noriyuki Fujiwara, Bao-Zhong Zheng, Osamu Muraoka, Genzoh Tanabe

Publikováno v: J. Chem. Soc., Perkin Trans. 1. :405-411

Facile enantioselective syntheses of the di-O-methyl ethers of the norlignans, (–)-agatharesinol (–)-1a, (+)-hinokiresinol (+)-2a and (–)-sugiresinol (–)-3a are described. Grignard addition of vinylmagnesium bromide to an aldimine (–)-13, p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68e8f718e28f150e2fbf010dc5404d72
https://doi.org/10.1039/p19960000405

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