Total synthesis of racemic lasidiol via intramolecular [4+3] cycloaddition
作者:Günter Kreiselmeier、Baldur Föhlisch
DOI:10.1016/s0040-4039(99)02296-0
日期:2000.2
Lasidiol, a sesquiterpenoid with a carotane skeleton, and its 8a-epimer have been synthesized in 12 steps starting from 2-methylfuran. Key elements in the synthesis are constructions of the carbon framework in an intramolecular [4+3] cycloaddition and cleavage of the epoxy-bridge by reductive elimination with sodium naphthalenide after reduction and hydrogenation of the bromo-substituted cycloadducts
Synthese de composes dicarbonyles-1,4 par reaction de Wittig sur des aldehydes, la methode peut etre etendue a la synthese de composes tricarbonyles-1,4,7
Synthese de composes dicarbonyles-1,4 par 反应 de Wittig sur des aldehydes, la methode peut etre etendue a la synthese de composes tricarbonyles-1,4,7
Sodium 6-methoxy-(,)-3,5-hexadienoate: a useful diene in the aqueous diels-alder reaction
作者:Paul A. Grieco、Kiyoshi Yoshida、Zhen-min He
DOI:10.1016/s0040-4039(01)81667-1
日期:1984.1
The sensitive dienol ether functionality in sodium 6-methoxy-(,)-3,5-hexadienoate has been shown to be compatible with the conditions of the aqueous Diels-Alderreaction.
The first synthesis of chiral phosphinocarboxylic acid ligands, trans-2-(diphenylphosphino)cycloalkanecarboxylic acids. The phosphine-palladium complexes catalyzed asymmetric allylic alkylation
synthesized chiral phosphinocarboxylic acids were effective as ligand for the palledium-catalyzed asymmetric allylic alkylation of 3-acetoxy-1,3-diphenyl-1-propene and 2-cyclohexenyl acetate with soft carbanion from dimethyl malonate or triethylphosphonoacetate and sodium hydride to give the alkylation products of up to 83% ee.
Synthesis and application of α-trifluoromethylated aldehydes
作者:Tsutomu Konno、Takashi Yamazaki、Tomoya Kitazume
DOI:10.1016/0040-4020(95)00863-4
日期:1996.1
for the synthesis of α-trifluoromethylatedaldehydes are described. One is a synthetic method via Pummerer rearrangement followed by the hydrolysis under the weakly basic condition, giving the recemic aldehyde. The other is via the oxidative cleavage of the corresponding diol under the acidic condition, affording the optically active compound for the first time. Furthermore, both aldehydes underwent