An Efficient and General Route to <i>g</i><i>em</i>-Difluoromethylenated α,β-Unsaturated δ-Lactones: High Enantioselective Synthesis of <i>g</i><i>em</i>-Difluoromethylenated Goniothalamins
作者:Zheng-Wei You、Zhong-Xing Jiang、Bing-Lin Wang、Feng-Ling Qing
DOI:10.1021/jo061012r
日期:2006.9.1
An efficient and general strategy to gem-difluoromethylenated α,β-unsaturated δ-lactones in high yields from various aldehydes (including aliphatic, aromatic, α,β-unsaturated, and sterically hindered aldehydes) has been developed. This methodology was successfully applied for the preparation of two enantiomers of gem-difluoromethylenated goniothalamins (S)-1 and (R)-1. gem-Difluoropropargylation of
已经开发了一种有效且通用的策略,以高产率从各种醛(包括脂族,芳族,α,β-不饱和和空间受阻的醛)中高产宝石-二氟甲基化的α,β-不饱和δ-内酯。该方法已成功地用于制备宝石-二氟甲基化的鹅油菌素(S)-1和(R)-1的两种对映体。宝石-肉桂醛的二氟炔丙基化,然后拆分由假单胞菌(AK)的脂肪酶介导的均丙炔醇,得到醇(R)-6和(S)-6。(的三键的选择性加氢小号- )6和(- [R )- 6以与喹啉,得到预期产物(的存在林德乐催化剂双键小号)-8和(- [R - )8分别。(S)-8和(R)-8脱保护,然后用催化的2,2,6,6-四甲基-1-哌啶基氧基(TEMPO)和过量的双乙酰氧基碘苯(BAIB)氧化所得的1,5-二醇提供了目标分子宝石-二氟甲基化的鸟苷(S)-1和(R)-1分别以高产率进行。