An enantiopure aza-analogue of pseudo-cocaine was synthesized starting from a 5-substituted 3-pyrazolidinone by using an N-acylhydrazonium ion cyclization with a dioxenone nucleophile as the key step. Copyright (C) 1996 Elsevier Science Ltd
Bicyclic molecules with the 1,7-diaza-6,6-dimethylbicyclo[2.2.1]heptane and 1,8-diaza-7,7-dimethylbicyclo[3.2.1]octane (1-aza-7,7-dimethyltropane) skeleton are shown to be efficiently synthesized via cyclization reactions of endocyclic N-acylhydrazonium intermediates. By using a protected β-ketoester as the internal nucleophile, azacocaine analogues are also accessible via this methodology.
Synthesis and evaluation of a putative acyl tetramic acid intermediate in tenellin biosynthesis in Beauveria bassiana. A new role for tyrosine
作者:M.Caragh Moore、Russell J Cox、Gordon R Duffin、David O'Hagan
DOI:10.1016/s0040-4020(98)00557-2
日期:1998.7
The acyltetramic acid 6 previously proposed as a putative intermediate in tenellin biosynthesis in Beauveria bassiana has been synthesised in two isotopically labelled forms. This compound was not incorporated into tenellin and was not identifiable in extracts of B. bassiana and is unlikely to be involved in tenellin biosynthesis. On the other hand a re-evaluation of the role of tyrosine reveals that
Method for the Rapid Synthesis of Highly Functionalized 2-Hydroxy-1-naphthoates. Syntheses of the Naphthoic Acid Components of Neocarzinostatin Chromophore and N1999A2
作者:Nan Ji、Brad M. Rosen、Andrew G. Myers
DOI:10.1021/ol048075l
日期:2004.11.1
describe a four-step sequence for the synthesis of complex 2-hydroxy-1-naphthoic acids involving Z-selective olefination of benzaldehyde derivatives with a novel dioxolenone-containing phenyl phosphonate reagent, followed by dioxolenone cleavage with alkaline trifluoroethanol and oxidative cyclization (Mn(OAc)(3)) of the resultant trifluoroethyl beta-keto esters. [reaction: see text]
Amido compounds and process for producing the same
申请人:——
公开号:US20010023297A1
公开(公告)日:2001-09-20
A 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compounds can be produced by reacting a 6-halomethyl-4H-2,3-dioxin-4-one compound with a primary or secondary amine and carbon monoxide. The reaction may be carried out in the presence of a catalyst comprising a platinum group metal. 3-oxopentanedicarboxylic acid monoamides and 3-oxopentanedicarboxylic acid amide esters can be are produced by reacting 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compound with an alcohol or water. Using such intermediates, 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compound, 3-oxopentanedicarboxylic acid amide esters can provide in an easy and simple and efficient manner.
6-Alkoxycarbonylmethyl-4H-1,3-dioxin-4-one derivatives are produced by reacting a 6-halomethyl-4H-1,3-dioxin-4-one derivative with carbon monoxide and an alcohol or water, and 3-oxopentanedicarboxylic acid esters are further produced by reacting the above derivatives with an alcohol or water. Such a process can produce 3-oxopentanedicarboxylic acid esters in an easy and simple and efficient manner.