Preparation of optically active cyclohexenones: Chirons for the lipophilic moiety of flowery- and woody-like odorant ketones
作者:Christian Chapuis、Robert Brauchli、Walter Thommen
DOI:10.1002/hlca.19930760135
日期:1993.2.10
Optically active 2,5,6,6- and 2,4,4,5-tetraalkylcyclohex-2-en-1-ones ((+)-2a–d and (−)-5a–d), important building blocks for flowery- and woody-like odorants, have been prepared. Compounds (+)-2a–d and (−)-5a–d were obtained by ozonolysis of the corresponding cyclopentenic precursors, followed by intramolecular aldol condensation. Alternatively, enones (+)-2a–d were reduced to the corresponding allylic
旋光的2,5,6,6-和2,4,4,5-四烷基环己基2-en-1-one((+)- 2a - d和(-)- 5a - d)是重要的结构单元已经制备了类似花和木质的香精。化合物(+)- 2a - d和(-)- 5a - d是通过臭氧分解相应的环戊烯前体得到的,然后进行分子内羟醛缩合。另外,烯酮(+)- 2a - d被还原为相应的烯丙醇,并通过酸性异构化和氧化转化为烯酮(-)- 5a - d。13给出了13 C-NMR分配。