A cooperative chiral guanidine/Ag(I) catalyst system was developed for the asymmetric isocyanoacetate aldol reaction with isatins. The corresponding chiral spirooxindole oxazolines were obtained in good yields (up to 99%), moderate diastereoselectivities (up to 88:12 dr) and good enantioselectivities (up to 90% ee).
                                    合作的手性
胍/Ag(I) 催化剂体系被开发用于不对称异
氰乙酸酯醛醇与
靛红的反应。以良好的产率(高达 99%)、中等的非对映选择性(高达 88:12 dr)和良好的对映选择性(高达 90% ee)获得了相应的手性螺环
吲哚恶唑啉。