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
描述了立体定向合成的dl-环戊素(1),证实了先前的结构和立体化学分配。将马尿酸10转化为顺式酯11,将其还原并分别环化为顺式和反式3-亚苄基-4-甲基-1- H -1,4-苯并二氮杂-2,5-二酮12和14。在另一种方法中,马尿酸5通过恶唑酮4转化为反式酯9。14的环氧化得到1。该方案的扩展提供了经由10 → 19 → 23 → 23 → 26 → 2到dl-环戊醇(2)的合成途径。