Stereospecific synthesis of dl-cyclopenin and dl-cyclopenol
作者:J.D. White、W.E. Haefliger、M.J. Dimsdale
DOI:10.1016/0040-4020(70)85023-2
日期:——
A stereospecific synthesis of dl-cyclopenin (1) is described corroborating previous structural and stereochemical assignments. The hippuric acid 10 was converted to cis ester 11 which was reduced and cyclized separately to cis and trans 3-benzylidene-4-methyl-1-H-1,4-benzodiazepin-2,5-diones 12 and 14. In an alternative approach, hippuric acid 5 was converted via oxazolone 4 to trans ester 9. Epoxidation