Reaction of benzolactams with triethyl phosphite prompted by phosphoryl chloride affords benzoannulated monophosphonates instead of expected bisphoshonates
gave cyclic aminomethylene-gem-bisphosphonates in reaction with triethyl phosphite and phosphoryl chloride, the corresponding benzoannulated lactams usually provide monophosphonates of variable structures, which depend on size of the substrate aliphatic ring. Most likely they are obtained by dephosphonylation of bisphosphonates, which form as initial products of this reaction. These phosphonate esters
Some intramolecular reactions of ortho-substituted aryl radicals
作者:Athelstan L. J. Beckwith、William B. Gara
DOI:10.1039/p29750000593
日期:——
ortho-Substitutedarylradicals have been generated by reduction of arenediazonium salts in aqueous solution by use of a flow cell. The e.s.r. spectra indicate that radicals containing olefinic bonds in the 5,6- or 6,7-positions with respect to the radical centre undergo rapid cyclization by addition to the 5- and 6-positions respectively to give the thermodynamically less stable products. No evidence
Process for preparing optically active 2-oxoimidazolidine derivatives
申请人:TANABE SEIYAKU CO., LTD.
公开号:EP0373881A2
公开(公告)日:1990-06-20
Disclosed are a process for preparing an optically active 2-oxoimidazolidine derivative of the formula:
wherein R¹ represents hydrogen atom or a lower alkyl group,
according to the process described in the specification; and a 3-acyl-2-oxoimidazolidine-4-carboxylic acid ester derivative having (S, R) configuration of the formula:
wherein R² represents a tert-butyl group or a benzyl group, and R³ represents a lower alkyl group or an aryl group.