Asymmetric Tandem Michael-Aldol Reactions between 3-Cinnamoyloxazolidine-2-thiones and Aldehydes
作者:Hironori Kinoshita、Takashi Osamura、Kazumi Mizuno、Sayaka Kinoshita、Tatsunori Iwamura、Shin-ichi Watanabe、Tadashi Kataoka、Osamu Muraoka、Genzoh Tanabe
DOI:10.1002/chem.200501435
日期:2006.5.3
Reactions between chiral 3-cinnamoyl-4-methyl-5-phenyl-1,3-oxazolidine-2-thiones and aromatic aldehydes in the presence of BF3Et2O diastereoselectively produced tricyclic compounds incorporating a bridgehead carbon bound to four heteroatoms in high yields. Four stereocenters were induced during the reaction. The tricyclic products were transformed into propane-1,3-diols bearing three consecutive stereocenters
在BF 3 Et 2 O非对映选择性地存在下,手性3-肉桂酰基-4-甲基-5-苯基-1,3-恶唑烷-2-硫酮与芳族醛之间的反应以高收率选择性地结合了桥键碳与四个杂原子结合的三环化合物。在反应过程中诱导了四个立体中心。通过酸水解,S-甲基化和手性助剂的还原去除,将三环产物转化为带有三个连续立体中心的丙烷-1,3-二醇。