A highly efficient and straightforward stereoselective synthesis of novel chiral α-acetylenic ketones
作者:Xavier Serrat、Gemma Cabarrocas、Sara Rafel、Montserrat Ventura、Anthony Linden、José M. Villalgordo
DOI:10.1016/s0957-4166(99)00357-2
日期:1999.8
ketones of type 3 has been developed. Starting from commercially available l-(−)-serine 4, and through the Garner's aldehyde 5, ethynyloxazolidine 2 was formed in good overall yield. Condensation of the corresponding lithium acetylide 7 with different aliphatic and aromatic aldehydes 5 and 8a–h at low temperatures yielded the respective propargylic alcohols 9a–i. Subsequent mild oxidation of 9a–i with
已经开发出非常有效和直接的新型3型手性α-炔基酮的合成。从可商购的1-(-)-丝氨酸4开始,并通过加纳醛5,以良好的总产率形成乙炔基恶唑烷2。相应的乙炔化锂7在低温下与不同的脂族和芳族醛5和8a – h缩合,生成相应的炔丙醇9a – i。随后用10-I-4-碘乙烷(IBX)12对9a – i进行轻度氧化几乎定量地获得了手性α-炔酮3a – i。