A highly enantioselective Darzens reaction between diazoacetamides and aldehydes catalyzed by a (+)-pinanediol–Ti(OiPr)4 system
作者:Gang Liu、Daming Zhang、Jian Li、Guangyang Xu、Jiangtao Sun
DOI:10.1039/c2ob27179f
日期:——
A highly efficient enantioselective Darzens reaction of aldehydes with diazoacetamides catalyzed by a (+)-pinanediol–Ti(OiPr)4 system has been developed. The cis-glycidic amides were obtained in high yields and with moderate to excellent enantioselectivity (up to 99%).
已经开发了由(+)-ane二醇-Ti(O i Pr)4系统催化的醛与重氮乙酰胺的高效对映选择性Darzens反应。所述CIS以高收率得到,并与中度至良好的对映选择性(高达99%) -缩水甘油酰胺。
An Asymmetric Catalytic Darzens Reaction between Diazoacetamides and Aldehydes Generates<i>cis</i>-Glycidic Amides with High Enantiomeric Purity
作者:Wei-Jun Liu、Bing-Da Lv、Liu-Zhu Gong
DOI:10.1002/anie.200903061
日期:2009.8.17
strength: The title reaction was catalyzed by a chiral titanium complex formed in situ from commercially available Ti(OiPr)4 and (R)‐binol, and gave cis‐glycidic amides with excellent enantiomeric purity (see scheme). This new method has been applied to the preparation of chiralbuildingblocksused for the synthesis of the side chain of taxol and (−)‐bestatin.
钛强度:标题反应是由由市售Ti(O i Pr)4和(R)-比诺醇原位形成的手性钛络合物催化的,得到具有出色对映体纯度的顺式-缩水甘油酰胺(参见方案)。此新方法已应用于制备用于合成紫杉醇和(-)-bestatin侧链的手性结构单元。