The cycloaddition of N-chlorosulfonyl-isocyanate with isoprene, butadiene and a polyolefin as well as the reaction of ketenes with some bis-azomethines were investigated. Suitably substituted bis-azomethines could be separated in the rac. and the meso-form. The reactivity of the azetidinones towards hydrolysis and hydrogenation was tested. Attempts to polymerise 4-vinyl-azetidin-2-one, polyazetidinone
Olivanic acid analogues. Part 1. Total synthesis of the 7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate system and some related β-lactams
作者:John H. Bateson、Andrew J. G. Baxter、Patricia M. Roberts、Terence C. Smale、Robert South-Gate
DOI:10.1039/p19810003242
日期:——
4-Allylazetidin-2-one, prepared from penta-1,4-diene and chlorosulphonyl isocyanate, has been used to synthesise the parent 7-oxo-1-azabicyclo[3.2.0] hept-2-ene-2-carboxylate system of the naturally occurring olivanic acids, using an intramolecular Witting reaction to construct the 2,3-double bond. Cyclisation of ketones derived from the 4-allyl grouping produced 3-substituted derivatives, while use
synthesized by ring closing metathesis (RCM) of sulfonates. The resulting α,β-unsaturated sultones act as dienophiles in intermolecular Diels-Alder reactions. A first cyclic sulfate formation throughRCM has been discovered, and a rapid access to p-lactams fused to a sultam moiety of variable ring size was developed from inexpensive, commercially available starting materials using RCM as the key operation
[EN] 2-CYANOPYRROLES AND THEIR ANALOGUES AS DDP-IV INHIBITORS<br/>[FR] 2-CYANOPYRROLES ET LEURS ANALOGUES EN TANT QU'INHIBITEURS DE DIPEPTIDYLPEPTIDASE-IV (DP-IV)
申请人:NOVO NORDISK AS
公开号:WO2004089362A1
公开(公告)日:2004-10-21
The present invention relates to therapeutically active and selective inhibitors of the enzyme DPP-IV having the formula I: (I) The invention furthermore relates to pharmaceutical compositions comprising the compounds and the use of such compounds for the manufacture of medicaments for treating diseases that are associated with proteins which are subject to inactivation by DPP-IV, such as type 2 diabetes and obesity.
Asymmetric induction in nitrile oxide cycloadditions to 3-butene-1,2-diol and derivatives
作者:Volker Jäger、Rudolf Schohe、Erich F Paulus
DOI:10.1016/s0040-4039(00)94123-6
日期:1983.1
Nitrile oxide cycloadditions to 3-butene-1,2-diol and derivatives thereof show varying degrees of erythro selectivity, ranging from 0 to ca. 0.9 kcal/mol. Some of these results are rationalized qualitatively on the basis of the Felkin-Anh-Houk model.