A new method for the aziridination of electron-deficient olefins using an N-chloro-N-sodio carbamate is described; the reaction was promoted by phase-transfer catalysis (solid–liquid) and afforded aziridines from α,β-unsaturated ketones, esters, sulfones and amides.
Intermolecular (4+3) cycloadditions of aziridinyl enolsilanes
作者:Sze Kui Lam、Sarah Lam、Wing-Tak Wong、Pauline Chiu
DOI:10.1039/c3cc48266a
日期:——
Upon activation by strong Brønsted acids, aziridinyl enolsilanes undergo (4+3) cycloadditions with dienes to afford aminoalkylated cycloheptenones as products. The use of a highly polar medium such as nitroalkane facilitates high cycloaddition yields of up to 99%. Optically pure aziridinyl enolsilanes react to yield (4+3) cycloadducts with up to 99% ee.
Clavulanic acid derivatives, their preparation and pharmaceutical compositions containing them
申请人:BEECHAM GROUP PLC
公开号:EP0013790B1
公开(公告)日:1982-09-22
DIPEPTIDYL PEPTIDASE-IV INHIBITORS
申请人:Kroth Heiko
公开号:US20100009961A1
公开(公告)日:2010-01-14
The present invention relates generally to pyrrolidine and thiazolidine DPP-IV inhibitor compounds. The present invention also provides synthetic methods for preparation of such compounds, methods of inhibiting DPP-IV using such compounds and pharmaceutical formulations containing them for treatment of DPP-IV mediated diseases, in particular, Type-2 diabetes.