نتایج جستجو برای: williamson ether synthesis

تعداد نتایج: 430501  

Journal: :The Journal of organic chemistry 2008
Douglass F Taber Ritesh B Sheth

2-Alkyl cyclohexenones are useful intermediates for organic synthesis. The Wittig reaction of a series of aldehydes with (cyclopropylmethyl)triphenylphosphonium bromide delivered the corresponding alkenyl cyclopropanes. UV irradiation in the presence of Fe(CO)5 converted the alkenyl cyclopropanes to the 2-substituted cyclohexenones. This approach enabled a three-step synthesis of the tricyclic ...

Journal: :Organic letters 2009
Olugbeminiyi O Fadeyi Craig W Lindsley

The second total synthesis of Brevisamide, a marine cyclic ether alkaloid from Karenia brevis, is reported. This streamlined synthesis proceeds in 21 steps, 14 steps longest linear sequence, in 5.2% overall yield and features a key SmI(2) reductive cyclization step to access the tetrasubstituted pyran core.

2010
Juliana M. Oliveira Dayvson J. Palmeira João V. Comasseto Paulo H. Menezes

The influence of protecting groups on the synthesis of regioand stereodefined vinyl tellurides derived from the reaction of BuTeNa and propargylicor homo-propargylic alcohols showed that TIPS silyl ether is useful as a regiodirecting group. The application of the methodology to the synthesis of a fragment of (±)-Seselidiol, a natural product, demonstrated the applicability of the new methodology.

Journal: :Journal of the Korea Academia-Industrial cooperation Society 2009

Journal: Polyolefins Journal 2015
Mercia Fernandes Walter Kaminsky,

Beside Ziegler-Natta and Phillips catalysts the development of methylaluminoxane (MAO) as cocatalyst in combination with metallocenes or other transition metal complexes for the polymerization of olefins has widely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. These catalysts allow the synthesis of is...

Journal: :The Journal of organic chemistry 2006
Yuguo Du Qi Chen Robert J Linhardt

The first total synthesis of the natural cytotoxic agent sporiolide A has been accomplished from D-glucal in 16 steps with 6.1% overall yield. Carbohydrates were applied as the chiral templates to manipulate the absolute configuration during the synthesis. Pyridinium chlorochromate (PCC)-promoted transformation of the cyclic enol-ether to lactone, followed by Yamaguchi esterification and intram...

2011
Gada K. Al-Ani Nipul Patel Karim A. Pirani Tongtong Zhu Subbhalakshmi Dhalladoo Rachel Zufferey

Ether glycerolipids of Leishmania major are important membrane components as well as building blocks of various virulence factors. In L. major, the first enzyme of the ether glycerolipid biosynthetic pathway, LmDAT, is an unusual, glycosomal dihydroxyacetonephosphate acyltransferase important for parasite's growth and survival during the stationary phase, synthesis of ether lipids, and virulenc...

Journal: :Chemical and Pharmaceutical Bulletin 1973

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