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A convenient synthesis of unsymmetrical secondary amines. formation of unstable formaldehyde imines.
The monoalkylation of aliphatic and aromatic primary amines can be accomplished by the reaction of organolithium or Grignard reagents with N-(cyanomethyl) or N-(aminomethyl) derivatives. 相似文献
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Homoharringtonine and dehydrodesoxy homoharringtonine were synthesized by partial esterification of cephalotaxine. 相似文献
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Reaction of mucochloric and mucobromic acid with (ethoxycarbonylmethylene) triphenyl-phosphorane affords the ethyl ester of (2, 4 -4,5-dichloro- and (2, 4) -4, 5-dibromo-2,4-pentadienoic acid respectively; in the latter case ethyl (2 -5-bromo-2-penten-4-ynoate is formed concomittantly. 相似文献
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The defense secretions of termite soldiers in the genera , , and contain sesqueterpene hydrocarbons, alcohols and ethers. Three new eudesmanes possessing the hitherto unknown 5β, 7β, 10β configuration were identified from . 相似文献
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The first total synthesis of 5-desoxyleukotriene D () is reported. The route of synthesis utilizes a novel method for five-carbon chain extension. The availability of allowed experimental demonstration that the 5-hydroxyl function is important for biological activity of the slow reacting substances. 相似文献
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Terence C. Smale 《Tetrahedron letters》1984,25(27):2913-2914
Incorporation of a chiral ketone into the established tetrahydro-1,3-oxazine route to thienamycin analogues, has enabled the isolation of single enantiomers having the naturally occurring ()-configuration at the bridgehead. 相似文献