Efficient Synthesis of β-Hydroxy-α-Amino Acid Derivatives via Direct Catalytic Asymmetric Aldol Reaction of α-Isothiocyanato Imide with Aldehydes
作者:Xiaohong Chen、Yin Zhu、Zhen Qiao、Mingsheng Xie、Lili Lin、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/chem.201000284
日期:2010.9.3
N′‐dioxide–nickel(II) complex catalyst has been developed for the direct catalytic asymmetric aldol reaction of α‐isothiocyanato imide with aldehydes which produces the products in morderate to high yields (up to 98 %) with excellent diastereo‐ (up to >99:1 d.r.) and enantioselectivities (up to >99 % ee). A variety of aromatic, heteroaromatic, α,β‐unsaturated, and aliphatic aldehydes were found to be suitable
已开发出一种容易获得且有效的手性N,N'-二氧化物-镍(II)络合物催化剂,用于α-异硫氰基酰亚胺与醛的直接催化不对称醛醇缩合反应,生成高品位的产物(产率高达98%) )具有极佳的非对映异构体(高达> 99:1 dr)和对映选择性(高达> 99%ee)。多种芳族,杂芳族,α,β -不饱和,和脂族醛的被认为是在2.5%(摩尔)的存在下合适的基材大号脯氨酸衍生的N,N- ' -二氧化L5–镍(II)配合物。此过程是耐空气的,并且可以使用现有试剂轻松进行操作。基于实验研究,提出了一种可能的过渡态来解释反应性和不对称电感性的起源。