The<i>MoritaBaylisHillman</i>Reaction of Chiral Highly Oxygenated Cyclopent-2-enones
作者:Chonticha Masusai、Darunee Soorukram、Chutima Kuhakarn、Patoomratana Tuchinda、Chaveng Pakawatchai、Vichai Reutrakul、Manat Pohmakotr
DOI:10.1002/hlca.201200421
日期:2012.10
The MoritaBaylisHillman (MBH) reactions of (4S,5R,7R,8R)‐ and (4R,5R,7R,8R)‐4‐hydroxy‐7,8‐dimethoxy‐7,8‐dimethyl‐6,9‐dioxaspiro[4.5]dec‐2‐en‐1‐ones (2 and 3, resp.) with aldehydes using various catalysts were studied. A combination of Bu3P/phenol in THF was found being optimum conditions giving the corresponding MBH adducts with high diastereoisomeric ratios. After separation, each stereomerically
的森田的Baylis 希尔曼(MBH)的(4反应小号,5 - [R,7 - [R,8 - [R )-和(4 - [R,5 - [R,7 - [R,8 - [R)-4-羟基-7,8-二甲氧基研究了使用各种催化剂的含醛的7,8-二甲基-6,9-二氧杂螺[4.5]癸-2-烯-1-酮(分别为2和3)。发现在THF中Bu 3 P /苯酚的组合是最佳条件,其给出具有高非对映异构体比率的相应的MBH加合物。分离后,MBH加合物使用1%aq.HCl水溶液进行水解。在超声清洗机的水浴中加入CF 3 COOH(TFA),以高收率得到相应的多羟基环戊烯酮。